removed hasattr check per PR feedback

Author: howlowck

python/packages/ag-ui/agent_framework_ag_ui/_orchestrators.py

@@ -636,7 +636,7 @@ def _build_messages_snapshot(tool_message_id: str | None = None) -> MessagesSnap
                 context.update_thread_id(conv_id)
                 should_recreate_event_bridge = True
 
-            if hasattr(update, "response_id") and update.response_id and update.response_id != context.run_id:
+            if update.response_id and update.response_id != context.run_id:
                 context.update_run_id(update.response_id)
                 should_recreate_event_bridge = True