BUG: Allow empty chunksize in stata reader when using iterator
- [X] closes #37280 
- [X] tests added / passed
- [X] passes `black pandas`
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

can you add a what's new note for the precision loss change (1.1.4) also pls merge master I rebased on master and added a what's new.
 Hello @bashtage! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:





There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-10-23 06:22:14 UTC small conflict and pls rebase thanks @bashtage  @meeseeksdev backport 1.1.x