Issue/dont save if nan

[peterdudfield]

Pull Request

Description

Dont save GSP Yields if theya re nans

Helps with openclimatefix/uk-pv-forecast-blend#8

How Has This Been Tested?

CI tests

• Yes

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Merging #71 (b7892e1) into main (7ce59d6) will increase coverage by 0.02%.
Report is 41 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   95.56%   95.58%   +0.02%     
==========================================
  Files           5        5              
  Lines         203      204       +1     
==========================================
+ Hits          194      195       +1     
  Misses          9        9              

Files Changed	Coverage Δ
gspconsumer/__init__.py	100.00% <100.00%> (ø)
gspconsumer/app.py	96.87% <100.00%> (+0.03%)	⬆️

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