TST: concat(..., copy=False) with datetime tz-aware data raises ValueError: cannot create a DatetimeTZBlock without a tz
…n version 0.24.1 but passes on current version

- [x] closes #25257
- [x] tests added / passed

Hello @SurajH1! 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 2020-07-12 10:18:23 UTC I'm not sure why the  Publish benchmarks artifact error is popping up on Travis-CI tests. Any help would be appreciated @jreback  can you merge master @SurajH1 i've pushed a few changes to the branch of this PR. I notice you raised the PR from master. In future you should create a seperate branch, see https://pandas.pydata.org/docs/dev/development/contributing.html#creating-a-branch Thanks @SurajH1 and @simonjayhawkins !