BUG: Fix segfault in csv tokenizer
- [x] closes #28071
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Hello @roberthdevries! 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 2020-03-15 07:19:35 UTC @roberthdevries pls merge master; ping on green. ping @jreback everything is green thanks @roberthdevries 