Fix ValueError crash when tab-set contains non-tab-item children #681

Job	Run time
pre-commit	18s
docs-build-format (latex)	13s
docs-build-format (html)	15s
docs-build-format (man)	14s
Tests (py3.12, Sphinx~=8.0, on ubuntu-latest)	36s
Tests (py3.12, Sphinx~=9.0, on ubuntu-latest)	42s
Tests (py3.14, Sphinx~=7.0, on ubuntu-latest)	35s
Tests (py3.12, Sphinx~=7.0, on ubuntu-latest)	44s
Tests (py3.13, Sphinx~=8.0, on ubuntu-latest)	36s
Tests (py3.13, Sphinx~=9.0, on ubuntu-latest)	41s
Tests (py3.11, Sphinx~=7.0, on windows-latest)	1m 24s
Tests (py3.14, Sphinx~=8.0, on ubuntu-latest)	30s
Tests (py3.11, Sphinx~=7.0, on ubuntu-latest)	42s
Tests (py3.11, Sphinx~=9.0, on ubuntu-latest)	33s
Tests (py3.11, Sphinx~=8.0, on ubuntu-latest)	35s
Tests (py3.14, Sphinx~=9.0, on windows-latest)	1m 5s
Tests (py3.13, Sphinx~=7.0, on ubuntu-latest)	53s
Tests (py3.13, Sphinx~=8.0, on windows-latest)	1m 15s
Tests (py3.14, Sphinx~=9.0, on ubuntu-latest)	30s
check	5s
Publish to PyPi	0s
	12m 26s

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