fix: fix handling of generic groups in rich table cells

[vagenas]

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Related Documentation

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Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling_core/transforms/serializer/doctags.py	80.00%	1 Missing ⚠️

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[dolfim-ibm]

lgtm

[PeterStaar-IBM]

great!

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