[issue34495] excess_args asserts if args == nullptr

[Tatyana]

New submission from Tatyana <tatyana at synopsys.com>:

Since version 3.7 PyTuple_GET_SIZE performs assert(PyTuple_Check(args)); Due to this change, object_new and object_init cannot be called with args == nullptr.

Such behavior breaks existing user's code, particularly a code generated with Swig.

----------
components: Library (Lib)
messages: 324041
nosy: tkrasnukha
priority: normal
pull_requests: 8390
severity: normal
status: open
title: excess_args asserts if args == nullptr
type: crash
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34495>
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