Add missing case when entity update is needed

[gdubicki]

Fixes #334

[codecov]

Codecov Report

Merging #350 (487949b) into main (9d252d7) will decrease coverage by 0.05%.
The diff coverage is 85.71%.

❗ Current head 487949b differs from pull request most recent head 76c52b6. Consider uploading reports for the commit 76c52b6 to get more accurate results

@@            Coverage Diff             @@
##             main     #350      +/-   ##
==========================================
- Coverage   80.83%   80.77%   -0.06%     
==========================================
  Files          63       63              
  Lines        2385     2388       +3     
==========================================
+ Hits         1928     1929       +1     
- Misses        457      459       +2     

Impacted Files	Coverage Δ
gitlabform/processors/abstract_processor.py	83.33% <85.71%> (-1.29%)	⬇️
gitlabform/processors/project/files_processor.py	85.58% <0.00%> (-0.91%)	⬇️