Fix objective sensitivity when parameters appear in the objective

[klamike]

#337 @andrewrosemberg

[joaquimg]

looks good

[klamike]

the general registry is down? 😮

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.17%. Comparing base (56efbf0) to head (240869e).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #340      +/-   ##
==========================================
+ Coverage   89.14%   89.17%   +0.02%     
==========================================
  Files          16       16              
  Lines        1963     1967       +4     
==========================================
+ Hits         1750     1754       +4     
  Misses        213      213              

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