fix language server crash when diagnosticMode is "workspace" and workspace contains jupyter notebooks that haven't yet been opened

[DetachHead]

fixes #1055

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

sympy (https://github.com/sympy/sympy)
-     Type of "eq" is "Unknown | Expr | Any | Integer | None" (reportUnknownVariableType)
+     Type of "eq" is "Unknown | None" (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:128:19 - warning: Argument type is unknown
+     Argument corresponds to parameter "expr" in function "_mexpand" (reportUnknownArgumentType)
-     Type of "mainlog" is "log | Any | Unknown | None" (reportUnknownVariableType)
+     Type of "mainlog" is "Unknown | None" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:132:5 - warning: Type of "other" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:132:5 - warning: Type of "other" is unknown (reportUnknownVariableType)
-     Type of "other" is "Expr | Any | Unknown" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:132:13 - warning: Type of "subs" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:132:13 - warning: Type of "subs" is unknown (reportUnknownMemberType)
-     Type of "subs" is "Unknown | Overload[(arg1: Mapping[Basic | complex, Expr | complex], arg2: None = None) -> Expr, (arg1: Iterable[tuple[Basic | complex, Expr | complex]], arg2: None = None, **kwargs: Any) -> Expr, (arg1: Expr | complex, arg2: Expr | complex) -> Expr, (arg1: Mapping[Basic | complex, Basic | complex], arg2: None = None, **kwargs: Any) -> Basic, (arg1: Iterable[tuple[Basic | complex, Basic | complex]], arg2: None = None, **kwargs: Any) -> Basic, (arg1: Basic | complex, arg2: Basic | complex, **kwargs: Any) -> Basic] | Any" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:132:21 - warning: Argument type is partially unknown
-     Argument corresponds to parameter "arg1" in function "subs"
-     Argument type is "log | Any | Unknown" (reportUnknownArgumentType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:134:9 - warning: Type of "eq" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:134:9 - warning: Type of "eq" is unknown (reportUnknownVariableType)
-     Type of "eq" is "Expr | Any | Unknown" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:134:14 - warning: Type of "subs" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:134:14 - warning: Type of "subs" is unknown (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:134:32 - warning: Argument type is partially unknown
-     Argument type is "log | Any | Unknown" (reportUnknownArgumentType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:134:41 - warning: Argument type is partially unknown
-     Argument corresponds to parameter "arg2" in function "subs"
-     Type of "args" is "Tuple[Expr] | Any | Unknown" (reportUnknownMemberType)
+     Type of "args" is "Unknown" (reportUnknownMemberType)
-     Type of "mainlog" is "Expr | Any | Unknown" (reportUnknownVariableType)
+     Type of "mainlog" is "Unknown" (reportUnknownVariableType)
-     Type of "args" is "Tuple[Expr] | Any | Unknown" (reportUnknownMemberType)
+     Type of "args" is "Unknown" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:138:17 - error: Operator "-" not supported for type "Basic | Any | Unknown" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:138:18 - warning: Type of "args" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:138:18 - warning: Type of "args" is unknown (reportUnknownMemberType)
-     Type of "args" is "tuple[Basic, ...] | Any | Unknown" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:139:9 - warning: Type of "eq" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:139:9 - warning: Type of "eq" is unknown (reportUnknownVariableType)
-     Type of "eq" is "Unknown" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:140:17 - warning: Type of "free_symbols" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:140:17 - warning: Type of "free_symbols" is unknown (reportUnknownMemberType)
-     Type of "free_symbols" is "Unknown | set[Basic] | Any" (reportUnknownMemberType)
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:142:23 - warning: Argument type is unknown
+     Argument corresponds to parameter "arg" in function "_linab" (reportUnknownArgumentType)
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:143:23 - warning: Argument type is unknown
-     Type of "logarg" is "Expr | Any | Unknown" (reportUnknownVariableType)
+     Type of "logarg" is "Expr | Unknown" (reportUnknownVariableType)
-     Type of "args" is "Tuple[Expr] | Any | Unknown" (reportUnknownMemberType)
+     Type of "args" is "Tuple[Expr] | Unknown" (reportUnknownMemberType)
-     Type of "eq" is "Unknown | Expr | Any" (reportUnknownVariableType)
+     Type of "eq" is "Unknown | Expr | Any | Self@Expr" (reportUnknownVariableType)
-     Type of "lhs" is "Unknown | Expr | Any" (reportUnknownVariableType)
+     Type of "lhs" is "Unknown | Expr | Any | Self@Expr" (reportUnknownVariableType)
-     Type of "lhs" is "Unknown | Expr | Any" (reportUnknownVariableType)
+     Type of "lhs" is "Unknown | Expr | Self@Expr | Any" (reportUnknownVariableType)
-     Type of "xreplace" is "Unknown | ((rule: Unknown) -> (Unknown | Expr)) | Any" (reportUnknownMemberType)
+     Type of "xreplace" is "Unknown | ((rule: Unknown) -> (Unknown | Expr)) | Any | ((rule: Unknown) -> (Unknown | Self@Expr))" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:460:9 - warning: Type of "f" is unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:460:9 - warning: Type of "f" is partially unknown
+     Type of "f" is "Unknown | Expr" (reportUnknownVariableType)
-     Type of "as_expr" is "(*gens: Unknown) -> Unknown" (reportUnknownMemberType)
+     Type of "as_expr" is "(*gens: Unknown) -> (Unknown | Expr)" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:463:34 - warning: Type of "subs" is unknown (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:463:34 - warning: Argument type is unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:463:34 - warning: Type of "subs" is partially unknown
-     Argument corresponds to parameter "rep" in function "__new__" (reportUnknownArgumentType)
+     Type of "subs" is "Unknown | Overload[(arg1: Mapping[Basic | complex, Expr | complex], arg2: None = None) -> Expr, (arg1: Iterable[tuple[Basic | complex, Expr | complex]], arg2: None = None, **kwargs: Any) -> Expr, (arg1: Expr | complex, arg2: Expr | complex) -> Expr, (arg1: Mapping[Basic | complex, Basic | complex], arg2: None = None, **kwargs: Any) -> Basic, (arg1: Iterable[tuple[Basic | complex, Basic | complex]], arg2: None = None, **kwargs: Any) -> Basic, (arg1: Basic | complex, arg2: Basic | complex, **kwargs: Any) -> Basic]" (reportUnknownMemberType)
-     Type of "a" is "Unknown | Expr | Any | Self@Expr | Self@Add | None" (reportUnknownVariableType)
+     Type of "a" is "Unknown | None" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:477:9 - warning: Type of "free" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:477:9 - warning: Type of "free" is unknown (reportUnknownVariableType)
-     Type of "free" is "Unknown | set[Basic] | Any" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:477:16 - warning: Type of "free_symbols" is partially unknown
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/bivariate.py:477:16 - warning: Type of "free_symbols" is unknown (reportUnknownMemberType)
-     Type of "free_symbols" is "Unknown | set[Basic] | Any" (reportUnknownMemberType)
-     Type of "decompose" is "(f: Unknown, ...) -> (list[Unknown] | list[Unknown | Poly] | Unknown)" (reportUnknownVariableType)
+     Type of "decompose" is "(f: Unknown, ...) -> (list[Unknown | Expr] | list[Unknown | Poly] | Unknown)" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/decompogen.py:9:5 - warning: Return type, "list[Expr] | list[Function | Pow] | list[Expr | Basic] | list[Function | Pow | Basic] | Unknown | list[Min | Max | Basic] | list[Unknown | Max | Min | Basic] | list[Basic] | list[Unknown | Poly | Basic] | list[Min | Max] | list[Unknown | Max | Min] | list[Unknown] | list[Unknown | Poly]", is partially unknown (reportUnknownParameterType)
+   /tmp/mypy_primer/projects/sympy/sympy/solvers/decompogen.py:9:5 - warning: Return type, "list[Expr] | list[Function | Pow] | list[Expr | Basic] | list[Function | Pow | Basic] | Unknown | list[Min | Max | Basic] | list[Unknown | Max | Min | Basic] | list[Basic] | list[Unknown | Expr | Basic] | list[Unknown | Poly | Basic] | list[Min | Max] | list[Unknown | Max | Min] | list[Unknown | Expr] | list[Unknown | Poly]", is partially unknown (reportUnknownParameterType)
-   /tmp/mypy_primer/projects/sympy/sympy/solvers/decompogen.py:51:16 - warning: Return type, "list[Expr | Basic] | list[Function | Pow | Basic] | Unknown | list[Min | Max | Basic] | list[Unknown | Max | Min | Basic] | list[Basic] | list[Unknown | Poly | Basic]", is partially unknown (reportUnknownVariableType)

... (truncated 1118 lines) ...

spack (https://github.com/spack/spack)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/duplicates.test/packages/virtual-build/package.py:15:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/duplicates.test/packages/virtual-build/package.py:15:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/blas-only-client/package.py:18:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/blas-only-client/package.py:18:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/conditional-edge/package.py:21:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/conditional-edge/package.py:22:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/conditional-edge/package.py:23:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/conditional-edge/package.py:21:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/conditional-edge/package.py:22:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/edges.test/packages/conditional-edge/package.py:23:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:10:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:10:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:12:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:12:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:14:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/t/package.py:14:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:10:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:10:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:12:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:12:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:13:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:13:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:14:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:14:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:15:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:15:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:17:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:17:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:12:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:12:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)

... (truncated 63 lines) ...

arviz (https://github.com/arviz-devs/arviz): 2.69x slower (12.8s -> 34.4s in a single noisy sample)