GEOPY-2482: Missing grouping of EM data in save directive for joint inversions

[domfournier]

GEOPY-2482 - Missing grouping of EM data in save directive for joint inversions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.34%. Comparing base (285b6a6) to head (ef74c74).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #280      +/-   ##
===========================================
+ Coverage    91.31%   91.34%   +0.03%     
===========================================
  Files          114      114              
  Lines         6112     6112              
  Branches       732      733       +1     
===========================================
+ Hits          5581     5583       +2     
+ Misses         339      338       -1     
+ Partials       192      191       -1     

Files with missing lines	Coverage Δ
...drivers/components/factories/directives_factory.py	98.28% <ø> (-0.03%)	⬇️
simpeg_drivers/joint/driver.py	91.66% <100.00%> (+0.90%)	⬆️

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