Handle empty inline markdown-it token arrays safely

[IshaKumari22]

Hi, I’m Isha.

This PR improves robustness of inline markdown-it processing by safely
handling empty or missing inline token arrays, preventing runtime errors
while preserving existing behavior.

All tests pass.
Thanks!

[mttrbrts]

Thanks for this contribution! Before we can merge, all commits need to be signed off for the Developer Certificate of Origin.

Please run:

git rebase HEAD~N --signoff  # where N = number of commits
git push --force-with-lease

See CONTRIBUTING.md for details.

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