[issue40938] urllib.parse.urlunsplit makes relative path to absolute (http:g -> http:///g)

[wyz23x2]

Change by wyz23x2 <wyz23x2 at 163.com>:


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versions: +Python 3.7, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40938>
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