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
35760380,MDExOlB1bGxSZXF1ZXN0MTcxNTcyMjI=,162,Change np.isnan to pd.isnull in conventions.py to handle _FillValue = '',4194485,closed,0,,,1,2014-06-15T23:10:29Z,2014-06-15T23:16:48Z,2014-06-15T23:16:35Z,NONE,,0,pydata/xarray/pulls/162,"At a number of spots in conventions.py, np.isnan was being used
to check possible fill values.  However, np.isnan is not implemented
for string types.  So, I've replaced np.isnan with pd.isnull.

Alas, I haven't been able to update the tests to cover _FillValue = '',
because doing so would involve significant changes throughout the
code base.
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