Fix bug when grouping on FACIES for non-standard static sources

[tnatt]

PR to fix a bug where users would get an KeyError on BULK if the csv-file contained FACIES but did not contain BULK.
Typically this would happen for non-standard static sources where BULK_OIL and BULG_GAS columns are kept.

[rnyb]

lgtm

[andreas-el]

I think it makes sense to pin pylint < 3.2.0 to avoid all this for the time being.
I have done so in my current PR, and already created an issue for resolving the pylint issues down the line.
Ref; #1292

[tnatt]

I think it makes sense to pin pylint < 3.2.0 to avoid all this for the time being. I have done so in my current PR, and already created an issue for resolving the pylint issues down the line. Ref; #1292

Thanks for letting me know @andreas-el! Yes, I saw your issue briefly and figured I just wait it out and see if you were going to address it soon 😄 But then I'll just pin it instead for the time being 👍