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
658938729,MDExOlB1bGxSZXF1ZXN0NDUwODQ0NTU0,4233,Linear interp with NaNs in nd indexer,37403847,closed,0,,,13,2020-07-17T06:57:59Z,2020-08-27T08:50:15Z,2020-08-27T08:49:48Z,CONTRIBUTOR,,0,pydata/xarray/pulls/4233,"<!-- Feel free to remove check-list items aren't relevant to your change -->

 - [x] Test added

When doing linear interpolatiion with an nd indexer that contains NaN's,  `xarray` previously threw a `KeyError` from the `missing._localize` function. This PR fixes this by swapping `np.min` and `np.max` with `np.nanmin` and `np.nanmax` in that function, ignoring any NaN values.
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