GEOPY-2045: Phi-d at Iter 0 shows as nan in the *.out file

[domfournier]

*GEOPY-2045 - Phi-d at Iter 0 shows as nan in the .out file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.60%. Comparing base (7428557) to head (6b30051).
Report is 12 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #171   +/-   ##
========================================
  Coverage    89.60%   89.60%           
========================================
  Files           81       81           
  Lines         4598     4598           
  Branches       606      606           
========================================
  Hits          4120     4120           
  Misses         323      323           
  Partials       155      155           

Files with missing lines	Coverage Δ
simpeg_drivers/driver.py	87.95% <100.00%> (ø)
simpeg_drivers/joint/driver.py	90.99% <100.00%> (ø)
simpeg_drivers/utils/testing.py	85.56% <100.00%> (ø)

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