BUG: GH31142 Fix for combine.Series
- [ ] closes #31142
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @jamesharrop! 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 2020-05-27 18:21:57 UTC Thanks James!

I think there will be some other comments, but it looks like you haven't applied `black` (see [contributing to the codebase](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#contributing-to-the-code-base)), and that the docstring doesn't quite conform to the [docstring standards](https://pandas.pydata.org/pandas-docs/stable/development/contributing_docstring.html), so in the meantime I'd advise you to read these documents Hi Marco
Thanks for your helpful comments, I have tried to make those corrections now. Thanks - looks like there's some conflicts that need to be resolved, see [here](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) for how to do that @jamesharrop still active? As mentioned by @jbrockmendel we don't want to add another public method here; there's a few other comments / questions outstanding @jamesharrop thanks for the PR - is this still active?  Closing as stale but ping if you'd like to pick back up