REGR: Dataframe.reset_index() on empty DataFrame with MI and datatime level
- [ ] closes #35606
- [ ] closes #35657
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

thanks @simonjayhawkins very nice @meeseeksdev backport 1.1.x

