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Closes #2714
Closes #2808
Some things which need explaining:
For the GRIB tests, these were failing because they were trying to use
cube.fill_value. I've changed them to usecube.data.fill_valueinstead. This is actually counter to our masked data saving strategy, but I don't see any point fixing it here since we've moved everything to Iris-GRIB. The behaviour should be changed there.I've removed all the tests in
iris.tests.unit.fileformats.netcdf.test__load_cube.TestFillValue. Beforefill_valuewas added as a cube attribute, these tests were testing that the fill-value from the file was propagated onto the cube's_my_dataattribute, a Biggus array. In the current code there's no way to obtain the fill value from a cube with lazy data, and hence no way to test this behaviour. Arguably one could realise the data as part of the test to do so, but that just seems like testing the behaviour of Dask and NetCDF4-python.