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
714844298,MDExOlB1bGxSZXF1ZXN0NDk3ODU3MTA0,4485,Handle scale_factor and add_offset as scalar,500246,closed,0,,,3,2020-10-05T13:31:36Z,2020-10-16T21:20:14Z,2020-10-11T20:06:33Z,CONTRIBUTOR,,0,pydata/xarray/pulls/4485,"The h5netcdf engine exposes single-valued attributes as arrays of shape
(1,), which is correct according to the NetCDF standard, but may cause
a problem when reading a value of shape () before the scale_factor and
add_offset have been applied.  This PR adds a check for the dimensionality
of add_offset and scale_factor and ensures they are scalar before they
are used for further processing, adds a unit test to verify that this
works correctly, and a note to the documentation to warn users of this
difference between the h5netcdf and netcdf4 engines.

 - [x] Closes #4471 
 - [x] Tests added
 - [x] Passes `isort . && black . && mypy . && flake8`
 - [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
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