This PR fixes the issue with `docx` with
complex/recursive/merged/malformed tables by skipping cells that could
not trace back to a valid `<w:tc>` element used by the `python-docx` due
to missing or improperly merged rows.
Accessing row.cells in such cases can raise a `ValueError` when
`python-docx` fails to resolve the full logical table layout. This PR
wraps those calls in `try/except` to skip problematic rows while
continuing to extract usable content from the rest of the document.
