GEOPY-2551: PGI fails with single simulation selected

[domfournier]

GEOPY-2551 - PGI fails with single simulation selected

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.20%. Comparing base (6d378f6) to head (40ae015).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #296   +/-   ##
========================================
  Coverage    91.19%   91.20%           
========================================
  Files          114      114           
  Lines         6191     6194    +3     
  Branches       757      757           
========================================
+ Hits          5646     5649    +3     
  Misses         345      345           
  Partials       200      200           

Files with missing lines	Coverage Δ
simpeg_drivers/joint/driver.py	89.76% <ø> (ø)
simpeg_drivers/joint/joint_petrophysics/options.py	100.00% <100.00%> (ø)

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