Fix performance of DualObjectiveValue when a ray is present

[odow]

Closes #232

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.77%. Comparing base (a05592e) to head (9936828).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #233      +/-   ##
===========================================
- Coverage   100.00%   99.77%   -0.23%     
===========================================
  Files            2        1       -1     
  Lines         1374     1351      -23     
===========================================
- Hits          1374     1348      -26     
- Misses           0        3       +3     

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[odow]

@trulsf want to test this branch?

[trulsf]

Thanks! Much faster calculations.