[utils] Fix crash in _report_ignoring_subs from c58b655 (#32762) #2900

Job	Run time
Select tests from inputs	1s
Linter	24s
Run tests (ubuntu-20.04, 2.6, cpython, core, sh)	4m 1s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 5s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	1m 7s
Run tests (ubuntu-20.04, 3.3, cpython, core, sh)	3m 23s
Run tests (ubuntu-20.04, 3.4, cpython, core, sh)	3m 31s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 13s
Run tests (ubuntu-20.04, 3.6, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.7, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.8, cpython, core, sh)	1m 5s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.10, cpython, core, sh)	59s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 7s
Run tests (ubuntu-20.04, 3.12, cpython, core, sh)	1m 23s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 32s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 42s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 40s
Run tests (windows-2019, 3.4, cpython, core, bat)	2m 15s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	1m 16s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 7s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	25s
	37m 43s

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