support reviews on a deleted file path

[adelowo]

Fixes #5418

[codecov-io]

Codecov Report

Merging #5880 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5880      +/-   ##
==========================================
- Coverage   37.98%   37.97%   -0.02%     
==========================================
  Files         329      329              
  Lines       48405    48406       +1     
==========================================
- Hits        18388    18381       -7     
- Misses      27376    27384       +8     
  Partials     2641     2641

Impacted Files	Coverage Δ
models/issue_comment.go	45.94% <0%> (-0.06%)	⬇️
modules/avatar/avatar.go	81.25% <0%> (-18.75%)	⬇️
models/unit.go	0% <0%> (-14.29%)	⬇️
models/repo_list.go	63.29% <0%> (-1.27%)	⬇️

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[zeripath]

I wish there was a way to avoid checking the error string in its entirety though - this could break over time.

This is actually a good candidate for a test as we can be sure that our targeted git actually works with a test