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
524043729,MDExOlB1bGxSZXF1ZXN0MzQxODk0NDY1,3545,Add defaults during concat 508,775186,closed,0,,,21,2019-11-17T20:47:07Z,2023-01-20T16:04:28Z,2023-01-20T16:04:28Z,CONTRIBUTOR,,0,pydata/xarray/pulls/3545,"
 - [x] Closes #508 
 - [x] Tests added
 - [x] Passes `black . && mypy . && flake8`
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API

Contined on issue #508 by removing exception when concat two datasets with disjoint variables and instead add the missing variable with np.nan.
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