id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
252813229,MDExOlB1bGxSZXF1ZXN0MTM3NjEwMzkw,1526,"Fixed issue #1520, by adding a if-else that checks for None",25015426,closed,0,,,3,2017-08-25T06:52:14Z,2017-09-01T17:58:42Z,2017-09-01T17:58:42Z,CONTRIBUTOR,,0,pydata/xarray/pulls/1526,"Made this fix for the issue #1520. I simpy added a test for None in the code and tested it with my ENVI-file that caused the problem that I reported. 

If I understood the test report correctly, the tests also passed. 

- [x] Closes #1520
- [x] Tests  passed
- [x] Passes git diff upstream/master | flake8 --diff
- [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
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