update file_blob_in_diff method

app/helpers/commit_helper.rb

@@ -89,7 +89,8 @@ module CommitHelper
 
   def file_blob_in_diff(repo, commit_id, diff)
     tree = repo.tree(commit_id)
-    diff.renamed_file ? (tree / diff.b_path) : (tree / (diff.a_path.presence || diff.b_path))
+    blob = diff.renamed_file ? (tree / diff.b_path) : (tree / (diff.a_path.presence || diff.b_path))
+    blob || diff.a_blob || diff.b_blob
   end
 
   def get_commit_id_for_file(diff, commit, parent_commit)

app/views/projects/git/commits/_diff.html.slim

@@ -32,6 +32,4 @@
       == render 'file_removed_not_changed', blob: blob
 
     - elsif !blob.binary?
-      - if (@project.repo.tree(commit_id) / diff.b_path).nil?
-        = "a_path=#{diff.a_path}; b_path=#{diff.b_path}"
       == render_diff(diff, diff_counter: diff_counter, comments: @comments)