AWS Lambda函数出现'NoneType' object is not iterable错误的排查求助

大家好，我写了一个AWS Lambda函数，用来调用外部API获取数据并做格式化处理，但运行时抛出了类型错误，提示'NoneType' object is not iterable，折腾了一阵还是找不到问题根源，想请各位帮忙排查下。

以下是我的Lambda函数相关代码片段：

try:
    with urllib.request.urlopen(api_url) as response:
        data=json.loads(response.read().decode())
        print(json.dumps(data, indent = 4 ))
except Exception as e :
    print(f"error reading data : {e} ")
    return {"statuscode":"500","body":"Error fetching data"}

games_messages = [game_format(game) for game in data]

运行后得到的错误信息如下：

"errorMessage": "'NoneType' object is not iterable",
"errorType": "TypeError",
"requestId": "11a9a46e-3abe-4f6e-8c38-278c0697238a",
"stackTrace": [
  "  File \"/var/task/lambda_function.py\", line 69, in lambda_handler\n    games_messages = [game_format(game) for game in data]\n",
  "  File \"/var/task/lambda_function.py\", line 15, in game_format\n    quarter_scores = ', '.join([f\"Q{q['Number']}: {q.get('AwayScore', 'N/A')}-{q.get('HomeScore', 'N/A')}\" for q in quarters])\n"
]
}

另外，我从API获取到的数据格式如下（截图）：

备注：内容来源于stack exchange，提问作者skavanas