"Cannot use 'in' operator" error when tsconfig file doesn't exist with type checking on

[JoshuaKGoldberg]

Bug Report

• TSLint version: 3.15.1
• TypeScript version: 2.0.3
• Running TSLint via: gulp-tslint

TypeScript code being linted

(file does not exist)

Actual behavior

stream.js:74
      throw er; // Unhandled stream error in pipe.
      ^

TypeError: Cannot use 'in' operator to search for 'resolvedModules' in undefined
    at Linter.lint (C:\Code\bellevuejs-linting\5. Advanced TSLint Rule\node_modules\tslint\lib\tslint.js:41:40)

Expected behavior

Some sort of error saying "hey, the file doesn't exist!"

Although the tslint recommendation is to only lint compiling code, it's common in projects such as gulp-tslint to lint during build.