Fix reading netcdf generated from FA file

[sandorkertesz]

This PR fixes the following NetCDF problems:

• fix issue when fields were assigned to variables without lat-lon/x-y dimensions
• fix getting the correct latitudes-longitudes when the variables "lat" and "lon" are used with the following mapping from x and y:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.78%. Comparing base (36b2d9c) to head (c25fa7e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #401   +/-   ##
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  Coverage    89.78%   89.78%           
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  Files          120      120           
  Lines         7653     7658    +5     
  Branches       675      675           
========================================
+ Hits          6871     6876    +5     
  Misses         651      651           
  Partials       131      131           

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