[stable31] fix(files.js): check,ether "show folder descr." is set or not

[backportbot]

Backport of PR #7788

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.36%. Comparing base (f36ab79) to head (8ca069d).
⚠️ Report is 10 commits behind head on stable31.

Additional details and impacted files

@@            Coverage Diff            @@
##           stable31    #7810   +/-   ##
=========================================
  Coverage     51.35%   51.36%           
=========================================
  Files           291      291           
  Lines         41673    41674    +1     
  Branches        867      867           
=========================================
+ Hits          21403    21404    +1     
  Misses        20151    20151           
  Partials        119      119           

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