fix same branch diff should compare by checksum

[nopcoder]

No description provided.

[codecov-io]

Codecov Report

Merging #878 into master will increase coverage by 0.04%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #878      +/-   ##
==========================================
+ Coverage   44.92%   44.96%   +0.04%     
==========================================
  Files         140      140              
  Lines       10857    10859       +2     
==========================================
+ Hits         4877     4883       +6     
+ Misses       5354     5352       -2     
+ Partials      626      624       -2     

Impacted Files	Coverage Δ
catalog/cataloger_diff.go	69.44% <33.33%> (+0.15%)	⬆️
catalog/cataloger_create_entry.go	94.73% <0.00%> (-5.27%)	⬇️
catalog/cataloger_create_repository.go	62.96% <0.00%> (+3.70%)	⬆️
catalog/cataloger_commit.go	82.60% <0.00%> (+5.79%)	⬆️

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