Location 1 PF coils don't work if there is no CS

[ajpearcey]

closes #1442

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.45455% with 168 lines in your changes missing coverage. Please review.

Project coverage is 27.20%. Comparing base (42780a9) to head (9475ece).

Files with missing lines	Patch %	Lines
process/physics_functions.py	57.89%	80 Missing ⚠️
process/physics.py	38.88%	22 Missing ⚠️
process/stellarator.py	4.34%	22 Missing ⚠️
process/io/sankey_funcs.py	0.00%	17 Missing ⚠️
process/current_drive.py	23.07%	10 Missing ⚠️
process/io/plot_proc.py	0.00%	4 Missing ⚠️
process/pfcoil.py	0.00%	3 Missing ⚠️
process/plasma_geometry.py	0.00%	3 Missing ⚠️
process/hcpb.py	33.33%	2 Missing ⚠️
process/dcll.py	50.00%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3364      +/-   ##
==========================================
+ Coverage   27.11%   27.20%   +0.08%     
==========================================
  Files          77       76       -1     
  Lines       17816    17781      -35     
==========================================
+ Hits         4831     4837       +6     
+ Misses      12985    12944      -41     

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[jonmaddock]

Can you either rebase this into a single commit or separate into the bug fix and error message addition to reduce the churn for this PR please. Otherwise fine.

[ajpearcey]

I've rebased and collapsed the new changes into one commit. Let know if this is what you had in mind.

[jonmaddock]

@ajpearcey I think the rebase has been performed incorrectly: there are now 84 changed files.

[ajpearcey]

Im dumb, so ill just bin the PR and start again. It'll be easier.

[ajpearcey]

this is now superseded by #3396