Do not duplicate file comments in Stash

[platan]

Some Checkstyle's checks (i.e. NewlineAtEndOfFile) reports violations at line 0. They become file comments in Stash. These file comments are lot loaded into SingleFileChanges and this cause file comments duplication.

[codecov-io]

Current coverage is 76.64% (diff: 100%)

Merging #157 into master will increase coverage by 0.10%

@@             master       #157   diff @@
==========================================
  Files           135        135          
  Lines          1820       1828     +8   
  Methods           0          0          
  Messages          0          0          
  Branches        183        185     +2   
==========================================
+ Hits           1393       1401     +8   
  Misses          368        368          
  Partials         59         59          

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