fix: serialize `None` according to return type

j178 / leetgo

Best LeetCode friend for geek. :snowboarder:

MIT License

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Closed j178 closed 6 months ago

j178 commented 6 months ago

Fixes #265

TODO:

[ ] release a new version of leetgo_py
[ ] release a new version of leetgo
[ ] notify to do a manual upgrade: .venv/bin/python -m pip install -U leetgo-py