[gitea] week 2025-16 cherry pick (gitea/main -> forgejo) (#7602)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7602
Reviewed-by: Gusted <gusted@noreply.codeberg.org>

routers/web/repo/pull.go

@@ -401,6 +401,7 @@ func setMergeTarget(ctx *context.Context, pull *issues_model.PullRequest) {
 
 // GetPullDiffStats get Pull Requests diff stats
 func GetPullDiffStats(ctx *context.Context) {
+	// FIXME: this getPullInfo seems to be a duplicate call with other route handlers
 	issue, ok := getPullInfo(ctx)
 	if !ok {
 		return
@@ -408,15 +409,15 @@ func GetPullDiffStats(ctx *context.Context) {
 	pull := issue.PullRequest
 
 	mergeBaseCommitID := GetMergedBaseCommitID(ctx, issue)
-
 	if mergeBaseCommitID == "" {
 		ctx.NotFound("PullFiles", nil)
 		return
 	}
 
+	// do not report 500 server error to end users if error occurs, otherwise a PR missing ref won't be able to view.
 	headCommitID, err := ctx.Repo.GitRepo.GetRefCommitID(pull.GetGitRefName())
 	if err != nil {
-		ctx.ServerError("GetRefCommitID", err)
+		log.Error("Failed to GetRefCommitID: %v, repo: %v", err, ctx.Repo.Repository.FullName())
 		return
 	}