Refactor: fix admin exception (#10400)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

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

admin/services.py

@@ -8,6 +8,7 @@ from api.db.services.user_service import TenantService
 from api.db.services.knowledgebase_service import KnowledgebaseService
 from api.utils.crypt import decrypt
 from api.utils import health_utils
+
 from api.common.exceptions import AdminException, UserAlreadyExistsError, UserNotFoundError
 from config import SERVICE_CONFIGS