I'm getting a failure on this line when running the tests. Can you recreate that from t'office?
```
  File "/home/byron/.local/lib/python2.7/site-packages/iris/fileformats/grib/grib_phenom_translation.py", line 119, in _make_grib1_cf_table
    units=cfdata.unit)
TypeError: 'NoneType' object is not iterable
```