Fix: handle missing w:styleId in DOCX to prevent KeyError #1417
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Issue
Issue #1413
Some DOCX files may have headings, table cells, or footnotes without a styleId (w:styleId).
The original converter crashes with:
KeyError: 'w:styleId'
Fix
Wrapped Mammoth conversion in try/except to catch missing w:styleId.
If missing, fallback safely and continue conversion.