Bugfix for cartesian grids netcdf load/save with isotopes

[sjdaines]

• function cartesian_to_internal(grid::CartesianLinearGrid, griddata::AbstractArray) strip out missing that will have been added by internal_to_cartesian

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.54%. Comparing base (9135e8a) to head (8b43f54).
Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Grids.jl	0.00%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
+ Coverage   54.88%   55.54%   +0.65%     
==========================================
  Files          39       41       +2     
  Lines        4267     4366      +99     
==========================================
+ Hits         2342     2425      +83     
- Misses       1925     1941      +16     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.