`Lib/test/test_capi/test_getargs.py` raises `NameError` when `_testinternalcapi` is not importable

[sobolevn]

Bug report

See this code:

cpython/Lib/test/test_capi/test_getargs.py

Lines 13 to 16 in 24aa562

	try:
	import _testinternalcapi
	except ImportError:
	_testinternalcapi = NULL

But, NULL = None is only set multiple lines below:

cpython/Lib/test/test_capi/test_getargs.py

Line 63 in 24aa562

NULL = None

All versions starting from 3.13 are affected.
I have a PR ready.

Linked PRs

• gh-149403: Fix NameError in Lib/test/test_capi/test_getargs.py #149404
• [3.14] gh-149403: Fix NameError in Lib/test/test_capi/test_getargs.py (GH-149404) #149406
• [3.13] gh-149403: Fix NameError in Lib/test/test_capi/test_getargs.py (GH-149404) #149407