Bug Fix for #13207. Added empty attribute for Index
- [x] closes #13207 
- [x] tests added / passed
- [x] passes `git diff upstream/master | flake8 --diff`
- [x] whatsnew entry

you need to do this on a new and separate branch. you are including  commits from another PR.

pls see [docs](http://pandas.pydata.org/pandas-docs/stable/contributing.html)
 @jreback I don't understand. I have worked for this fix and committed on a seperate branch named : my_branch2, like the docs say,
and then executed git push origin my_branch2.
I am not able to identify what is causing this problem.
Just below the heading on this page it is also showing
pydata:master from pfrcks:my_branch2
 you branched off of the prior branch rather than master, rebase

`git rebase -i origin/master` and force push
