[issue39822] Use NULL instead of None for empty attrib in C implementation of Element

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


----------
keywords: +patch
pull_requests: +18092
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18735

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39822>
_______________________________________