[HOT FIX] fixed bug in file_utils

[Remi-Gau]

implement bug fix #166 onto master branch

[codecov]

Codecov Report

Merging #168 (fa88e2e) into master (cca6d50) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master    #168   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          11      11           
  Lines         864     864           
======================================
  Misses        864     864           

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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Impacted Files	Coverage Δ
+bids/+internal/file_utils.m	0.00% <0.00%> (ø)

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