Added else to account for divlife_cal not being set correctly

[j-a-foster]

Description

Fixes divlife_cal not being set, causing coe to be NaN.

Checklist

I confirm that I have completed the following checks:

• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 27.21%. Comparing base (f6af42a) to head (19e5e63).

Files with missing lines	Patch %	Lines
process/costs.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3359      +/-   ##
==========================================
- Coverage   27.22%   27.21%   -0.01%     
==========================================
  Files          76       76              
  Lines       17758    17762       +4     
==========================================
  Hits         4834     4834              
- Misses      12924    12928       +4     

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