masked arrays do not roundtrip with all false masks

[Brett Graham]

Description of the problem

Attempting to save a masked array with an all false mask results in no errors. Yet when loaded the array is no longer masked.

See:

asdf/asdf/_core/_converters/ndarray.py

Lines 121 to 125 in 4a0064a

 if isinstance(data, ma.MaskedArray) and np.any(data.mask): 
     if options.storage_type == "inline": 
         ctx._blocks._set_array_storage(data.mask, "inline") 
  
     result["mask"] = data.mask 

I believe that removing np.any(data.mask) would fix the issue.

Example of the problem

System information

asdf version: main
python version: python 3.10
operating system: mac