Minor tweats (#11271)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/db/services/knowledgebase_service.py

@@ -424,6 +424,7 @@ class KnowledgebaseService(CommonService):
 
         # Default parser_config (align with kb_app.create) — do not accept external overrides
         payload["parser_config"] = get_parser_config(parser_id, kwargs.get("parser_config"))
+
         return payload