[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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