目录页面类型page导出失败

[loseblue]

类似
https://www.notion.so/Life-wiki-9fd5df673bc44b6583f419ad49a4d1af
这样的样式，导出失败。

AttributeError: 'ColumnListBlock' object has no attribute 'title'
Traceback:
File "/app/.heroku/python/lib/python3.6/site-packages/streamlit/ScriptRunner.py", line 319, in _run_script
    exec(code, module.__dict__)
File "/app/notion-md-exporter.py", line 187, in <module>
    notion_markdown_export(token_v2, url, directory)
File "/app/notion-md-exporter.py", line 136, in notion_markdown_export
    if children.title: