fix: Unsupported NoneType on Python older than 3.10

[mshudrak]

In Python3 older than 3.10 we have the following error:

TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'.

This commit fixes this issue.

Fix #238

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[mshudrak]

@ZetaTwo PTAL.

[peb-peb]

The fix works for me. Otherwise, I am unable to test my local changes.

Tested on: Windows 10 and Ubuntu 20.04 LTS (both machine have python 3.10)