test: clean error

retrieve_kb.py

@@ -14,7 +14,7 @@ def get_current_knowledge_bases(client):
         knowledge_boxes = client.list_collections()
         return knowledge_boxes
     except Exception as e:
-        raise Exception(f"{str(e)}")
+        return f"{str(e)}"
 
 
 def get_knowledge_base_information(