TST: multi indexing when one column exclusively contains NaT(#38025)
- [X] closes #38025
- [X] tests added / passed
- [X] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them

Thanks for the PR @AliSayyah, but seems your test is broken > Thanks for the PR @AliSayyah, but seems your test is broken

I'll fix it. Thank you. thanks @AliSayyah 