parametrize fails on null string in 8.0.dev

[pllim]

This was originally reported at #11489 (comment) but was asked to open a new issue for it. Also see:

• pytest 8.0 compat for test_all_masked_input_str astropy/astropy#15548

Caused by:

• Duplicated parameters in parametrize marker #11489

pytest/src/_pytest/python.py

Line 1006 in ed8701a

if id[-1].isdigit():

To reproduce the failure, create a test using parametrize marker and include empty string as one of the parametrize inputs. Example traceback:

_ ERROR collecting astropy/time/tests/test_mask.py _
...
_pytest/python.py:1338: in parametrize
    ids = self._resolve_parameter_set_ids(
_pytest/python.py:1461: in _resolve_parameter_set_ids
    return id_maker.make_unique_parameterset_ids()
_pytest/python.py:1006: in make_unique_parameterset_ids
    if id[-1].isdigit():
E   IndexError: string index out of range