fix(msword_backend): handle conversion error in label parsing

[imvladikon]

Description:
fix(msword_backend): Handle conversion error in label parsing

Updated the label parsing logic to use str_to_int with a default value, preventing potential conversion errors when unexpected formats are encountered.

Steps to Reproduce:
The issue can be reproduced using the attached document, which contains a paragraph style: "Shell title: Table and Figure".

Code to Reproduce:

from docling.document_converter import DocumentConverter

converter = DocumentConverter()
_ = converter.convert("issue_paragraph_style.docx")

Attachment:
issue_paragraph_style.docx

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PS: Thank you for this excellent package!

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Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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[maxmnemonic]

Hey @imvladikon, thanks for the fix!
Attached docx however don't drop an error when I try to reproduce it, but as we handle rest of such situations on backend with str_to_int, make sense to also use it here.

Can you please sign your commit:
In your local branch, run: git rebase HEAD~1 --signoff
Force push your changes to overwrite the branch: git push --force-with-lease origin fix/msword-backend-handle-conversion-error-in-label-parsing

That will satisfy DCO and we can proceed with merging

[imvladikon]

I did it!
Thank you @maxmnemonic !

[maxmnemonic]

nice!