Do not show 500 error when default branch doesn't exist (#34096) (#34097)

Backport #34096

services/context/context_response.go

@@ -151,7 +151,7 @@ func (ctx *Context) notFoundInternal(logMsg string, logErr error) {
 
 	ctx.Data["IsRepo"] = ctx.Repo.Repository != nil
 	ctx.Data["Title"] = "Page Not Found"
-	ctx.HTML(http.StatusNotFound, base.TplName("status/404"))
+	ctx.HTML(http.StatusNotFound, "status/404")
 }
 
 // ServerError displays a 500 (Internal Server Error) page and prints the given error, if any.