Fix minor spacing issue
Continuation of #13350
- [x] closes #13032 
- [ ] tests added / passed
- [x] passes `pep8radius master --diff`
- [x] whatsnew entry - not necessary

See https://github.com/pydata/pandas/pull/13350 for more details, mucked up my pull request. Tests will need a lot of work.

@jreback Should be up to date now. Tests still a mess.
 @barrymoo Do you have time to update this?
 I don't have enough time to fix the tests. I originally closed the pull request but I was asked to revive it.
 OK, thanks for letting us know. I will then close this PR, but point on the issue to this PR as a start if someone else is able to take it on further.
