[santisoler]

Summary

Fix bug on compute_complex_mu: when dchi has at least one null value, the VRM effects were not taken into account, returning only real values of mu. Fix the bug by making the right check for all null values in dchi. Add test for the bugfix.

PR Checklist

• If this is a work in progress PR, set as a Draft PR
• Linted my code according to the style guides.
• Added tests to verify changes to the code.
• Added necessary documentation to any new functions/classes following the
  expect style.
• Marked as ready for review (if this is was a draft PR), and converted
  to a Pull Request
• Tagged @simpeg/simpeg-developers when ready for review.

Reference issue

This bug is analogous to the one reported in #1706 and tackled in #1729.

What does this implement/fix?

Additional information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.62%. Comparing base (9703e1f) to head (c19ada3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1748      +/-   ##
==========================================
+ Coverage   81.59%   81.62%   +0.02%     
==========================================
  Files         422      423       +1     
  Lines       55415    55492      +77     
  Branches     5258     5258              
==========================================
+ Hits        45218    45297      +79     
+ Misses       8793     8791       -2     
  Partials     1404     1404              

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