Fix netcdf output

[HCookie]

Ensure variable creation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.03%. Comparing base (2385b2d) to head (6dd8da2).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #98   +/-   ##
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  Coverage    98.03%   98.03%           
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  Files            3        3           
  Lines           51       51           
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  Hits            50       50           
  Misses           1        1           

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[dietervdb-meteo]

At least functionally this seems to work. I just ran a successful test with this branch that removed an earlier tp error present in the netcdf output, and which I assume this PRs aim it was to fix.

I might not be qualified to review code quality, so if that would be required maybe an additional review by someone more appropriate for that would be good.

Otherwise no objections to merging from me.

Thanks for the work, I would like netcdf output to work as soon as possible.