[issue35001] ImportFrom level cannot be optional

[thautwarm]

thautwarm <yaoxiansamma at gmail.com> added the comment:

Firstly, allowing to construct ImportFrom without `level` specified could be the result of referring Python-asdl.

Secondly, in C level, `level` is always an integer.

Last but not the least, when you can access `level` from an ImportFrom AST, it must be an integer, not None.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35001>
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