[issue18857] urlencode of a None value uses the string 'None'

[James Addison]

Change by James Addison <jay+bpo at jp-hosting.net>:


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pull_requests: +19264
pull_request: https://github.com/python/cpython/pull/19949

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue18857>
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