feat: knowledge pipeline (#25360)

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api/core/app/apps/chat/app_runner.py

@@ -164,7 +164,9 @@ class ChatAppRunner(AppRunner):
                 config=app_config.dataset,
                 query=query,
                 invoke_from=application_generate_entity.invoke_from,
-                show_retrieve_source=app_config.additional_features.show_retrieve_source,
+                show_retrieve_source=(
+                    app_config.additional_features.show_retrieve_source if app_config.additional_features else False
+                ),
                 hit_callback=hit_callback,
                 memory=memory,
                 message_id=message.id,