NPE in NewlinesRule.kt

[diphtongue]

What's done:

• Fixed NPE on test

Closes #1779

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (65d5558) 78.45% compared to head (ff6f34a) 78.42%.

Files	Patch %	Lines
...iktat/ruleset/rules/chapter3/files/NewlinesRule.kt	57.14%	0 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1853 +/- ## ============================================ - Coverage 78.45% 78.42% -0.03% Complexity 2442 2442 ============================================ Files 133 133 Lines 8630 8632 +2 Branches 2176 2179 +3 ============================================ - Hits 6771 6770 -1 Misses 896 896 - Partials 963 966 +3 ```

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[github-actions[bot]]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   164 files     164 suites   6m 10s :stopwatch: 1 409 tests 1 373 :heavy_check_mark: 36 :zzz: 0 :x: 2 788 runs  2 752 :heavy_check_mark: 36 :zzz: 0 :x:

Results for commit 550d4a43.

[github-actions[bot]]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   164 files     164 suites   7m 9s :stopwatch: 1 409 tests 1 392 :heavy_check_mark: 17 :zzz: 0 :x: 2 788 runs  2 771 :heavy_check_mark: 17 :zzz: 0 :x:

Results for commit 550d4a43.