fix missing return []

src/Controller/AskSseController.php

@@ -590,7 +590,9 @@ final readonly class AskSseController
                 @fclose($handle);
             }
         }
+        return [];
     }
+
     private function resolveLastEventId(Request $request): int
     {
         $header = trim((string) $request->headers->get('Last-Event-ID', ''));