support reviewing on a deleted file path (#5880)

models/issue_comment.go

@@ -873,10 +873,11 @@ func CreateCodeComment(doer *User, repo *Repository, issue *Issue, content, tree
 	// No need for get commit for base branch changes
 	if line > 0 {
 		commit, err := gitRepo.LineBlame(pr.GetGitRefName(), gitRepo.Path, treePath, uint(line))
-		if err != nil {
+		if err == nil {
+			commitID = commit.ID.String()
+		} else if err != nil && !strings.Contains(err.Error(), "exit status 128 - fatal: no such path") {
 			return nil, fmt.Errorf("LineBlame[%s, %s, %s, %d]: %v", pr.GetGitRefName(), gitRepo.Path, treePath, line, err)
 		}
-		commitID = commit.ID.String()
 	}
 
 	// Only fetch diff if comment is review comment