test_ssl: `non_linux_skip_if_other_okay_error` assumes err.reason is a string

[encukou]

Recently, test_ssl has been failing intermittently but frequently on macOS buildbots, see for example here.

Since #108315, there's some code to skip tests, which does getattr(err, "reason", "") on an arbitrary exception and expects that to be a string. If reason is set to None, a regex search on it fails. This prevents the calling test from checking that the error is correct.

Traceback (most recent call last):
 File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_ssl.py", line 5085, in test_preauth_data_to_tls_server
 self.non_linux_skip_if_other_okay_error(wrap_error)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
 File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_ssl.py", line 5032, in non_linux_skip_if_other_okay_error
 re.search('wrong.version.number', getattr(err, "reason", ""), re.I)):
 ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/re/__init__.py", line 177, in search
 return _compile(pattern, flags).search(string)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
TypeError: expected string or bytes-like object, got 'NoneType'

I'll send a PR soon.

Linked PRs

• gh-126499: test_ssl: Don't assume err.reason is a string #126501
• [3.12] gh-126499: test_ssl: Don't assume err.reason is a string (GH-126501) #126573
• [3.13] gh-126499: test_ssl: Don't assume err.reason is a string (GH-126501) #126574

[encukou]

I'll watch the buildbot for a day or two before backporting the fix.