Fix semicolon rule on last line without EOF line.

[mxl]

PR checklist

• New bugfix
  • Includes tests

Overview of change:

Currently when using "semicolon": [true, "never"] rule if semicolon is used in last line without next EOF line then linting fails with error:

Warning: Cannot read property 'kind' of undefined

because here util.getNextToken() return value is not tested for undefined.

I put tests in separate directory and not in semicolon/never/test.ts.* to avoid accidental appending to that files that will ruin this test.

CHANGELOG.md entry:

[bugfix] semicolon

[ajafff]

@mxl Thank you for taking the time to analyse and fix this bug.

Unfortunately that has already been done as part of a bigger change in #2655. That one also includes similar regression tests.

[mxl]

@ajafff Glad to hear that!