fix(india): transporter name is null while generating e-way bill (backport #30736)

[mergify]

This is an automatic backport of pull request #30736 done by Mergify.
Cherry-pick of 6291b28 has failed:

On branch mergify/bp/version-12-hotfix/pr-30736
Your branch is up to date with 'origin/version-12-hotfix'.

You are currently cherry-picking commit 6291b28c37.
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Unmerged paths:
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	both modified:   erpnext/regional/india/e_invoice/utils.py

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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