minor fix

agentcourse_unit4/api/agent_eval_api.py

@@ -18,7 +18,7 @@ class AgentEvalApi:
         """Get complete list of filtered questions with all associated data"""
         response = requests.get(self.questions_url, timeout=15)
         response.raise_for_status()
-        return response.json(object_hook=to_question_response) | []
+        return response.json(object_hook=to_question_response)
 
     def download_file(self, task_id: str) -> bytes:
         """Download the file associated with the given task_id"""