Fill gsp values

[peterdudfield]

Pull Request

Description

If GSP values can interpolate values, return zeros.
This is not ideal, but we are getting rid of this library, so its a stop gap.
Also note that Pnvet app doesnt use these values, its just the pipeline for all the satellite and nwp data that does.

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

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.83%. Comparing base (6bab08b) to head (c77eebd).
Report is 46 commits behind head on main.

Files with missing lines	Patch %	Lines
ocf_datapipes/load/gsp/database.py	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
- Coverage   78.36%   77.83%   -0.53%     
==========================================
  Files         126      127       +1     
  Lines        5962     6005      +43     
==========================================
+ Hits         4672     4674       +2     
- Misses       1290     1331      +41     

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