[issue41122] functools.singledispatchfunction has confusing error message if no positional arguments are passed in

[mental]

Change by mental <m3nta1 at yahoo.com>:


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nosy: +mental
nosy_count: 2.0 -> 3.0
pull_requests: +22111
pull_request: https://github.com/python/cpython/pull/23212

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41122>
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