Fix ValueError crash when tab-set contains non-tab-item children (#258) #684

Job	Run time
docs-build-format (man)	12s
docs-build-format (html)	15s
docs-build-format (latex)	13s
pre-commit	16s
Tests (py3.14, Sphinx~=8.0, on ubuntu-latest)	30s
Tests (py3.11, Sphinx~=7.0, on ubuntu-latest)	42s
Tests (py3.14, Sphinx~=9.0, on ubuntu-latest)	30s
Tests (py3.13, Sphinx~=9.0, on ubuntu-latest)	37s
Tests (py3.12, Sphinx~=8.0, on ubuntu-latest)	40s
Tests (py3.13, Sphinx~=8.0, on windows-latest)	1m 24s
Tests (py3.11, Sphinx~=9.0, on ubuntu-latest)	35s
Tests (py3.14, Sphinx~=9.0, on windows-latest)	1m 18s
Tests (py3.11, Sphinx~=7.0, on windows-latest)	2m 0s
Tests (py3.13, Sphinx~=8.0, on ubuntu-latest)	41s
Tests (py3.12, Sphinx~=9.0, on ubuntu-latest)	42s
Tests (py3.13, Sphinx~=7.0, on ubuntu-latest)	48s
Tests (py3.11, Sphinx~=8.0, on ubuntu-latest)	38s
Tests (py3.14, Sphinx~=7.0, on ubuntu-latest)	40s
Tests (py3.12, Sphinx~=7.0, on ubuntu-latest)	46s
check	4s
Publish to PyPi	0s
	13m 31s

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