[SDCISA-13736] Fix bad habits in FileSystemStorage.

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[codecov]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (1b13c2f) 63.35% compared to head (4fba5af) 62.90%.

Files	Patch %	Lines
...a/org/swisspush/reststorage/FileSystemStorage.java	40.81%	23 Missing and 6 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #165      +/-   ##
=============================================
- Coverage      63.35%   62.90%   -0.46%     
  Complexity       392      392              
=============================================
  Files             32       32              
  Lines           2549     2569      +20     
  Branches         293      296       +3     
=============================================
+ Hits            1615     1616       +1     
- Misses           776      792      +16     
- Partials         158      161       +3     

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