fix bug about reload knowledgebase configuration reloading (#210)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

Issue link:#[[Link the issue
here](https://github.com/infiniflow/ragflow/issues/209)]

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/apps/chunk_app.py

@@ -79,7 +79,7 @@ def list():
         return get_json_result(data=res)
     except Exception as e:
         if str(e).find("not_found") > 0:
-            return get_json_result(data=False, retmsg=f'Index not found!',
+            return get_json_result(data=False, retmsg=f'No chunk found!',
                                    retcode=RetCode.DATA_ERROR)
         return server_error_response(e)
 
@@ -262,6 +262,6 @@ def retrieval_test():
         return get_json_result(data=ranks)
     except Exception as e:
         if str(e).find("not_found") > 0:
-            return get_json_result(data=False, retmsg=f'Index not found!',
+            return get_json_result(data=False, retmsg=f'No chunk found! Check the chunk status please!',
                                    retcode=RetCode.DATA_ERROR)
         return server_error_response(e)

api/db/services/knowledgebase_service.py

@@ -44,7 +44,8 @@ class KnowledgebaseService(CommonService):
     def get_detail(cls, kb_id):
         fields = [
             cls.model.id,
-            Tenant.embd_id,
+            #Tenant.embd_id,
+            cls.embd_id,
             cls.model.avatar,
             cls.model.name,
             cls.model.language,