Improve parametrize error for non-sequence values#14693
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Fixes #14619.
When a trailing-comma parametrization receives a scalar value such as
None, collection currently raises an unhandledTypeErrorwhile checkinglen(param.values). Report a normal, actionable parametrization error instead, and add a regression test.Tests:
python -m pytest testing/test_mark.py -qpython -m compileall -q src/_pytest/mark testing/test_mark.py