bpo-31905

[Gerardwx]

Add check for None

https://bugs.python.org/issue31905

[the-knights-who-say-ni]

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[Gerardwx]

CLA signed.

[pablogsal]

IMHO this doesn't seem a bug (as is already suggested in the issue). Notice that any object (not only None) that doesn't implement _version will raise AttributeError. Checking for None only will be very confusing because it will return False but other things will not.

[vstinner]

Please elaborate the PR title.

[Mariatta]

Since the issue has been closed, and determined as not a bug, I'm closing this PR.
Thanks!