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Merge #1137

1137: Avoid warning when setting a masked value r=hgrecco a=dopplershift

When the underlying data is a masked array, __setitem__ can be given a sentintel np.ma.masked or masked values. This avoids passing them to math.isnan which causes a warning:
```
miniconda3/envs/py38/lib/python3.8/site-packages/pint/quantity.py:1782: UserWarning: Warning: converting a masked element to nan.
    if math.isnan(value):
```

- [ ] Closes # (insert issue number)
- [x] Executed ``black -t py36 . && isort -rc . && flake8`` with no errors
- [x] The change is fully covered by automated unit tests
- [ ] Documented in docs/ as appropriate
- [x] Added an entry to the CHANGES file


Co-authored-by: Ryan May <rmay@ucar.edu>

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