Gracefully handle the case of missing facets required by esmvalcore.io.local.LocalDataSource

[bouweandela]

Description

Do not raise an exception if a facet required by esmvalcore.io.local.LocalDataSource is missing, but log the problem and continue. Maybe the data can be found using some other data source and if not, the user will see the log message.

Closes #2995

Link to documentation:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.70%. Comparing base (69f2019) to head (c4b0316).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3021   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files         267      267           
  Lines       15768    15793   +25     
=======================================
+ Hits        15090    15115   +25     
  Misses        678      678           

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[schlunma]

Great, thanks Bouwe! Works exactly as expected.

I just have some minor comments on the code.

[schlunma]

Looks good now, thanks Bouwe 🚀

[bouweandela]

Thanks for pushing this across the finish line @schlunma!