Catch errors on deleting items with nonexistent files

[isc-etamarch]

Fix #524

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 25.97%. Comparing base (7bbcfd1) to head (40258d4).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...ceControl/Git/PullEventHandler/IncrementalLoad.cls	0.00%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
+ Coverage   25.94%   25.97%   +0.02%     
==========================================
  Files          18       18              
  Lines        2713     2745      +32     
==========================================
+ Hits          704      713       +9     
- Misses       2009     2032      +23     

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