Fix iteraction between ComputeIdealPoint and MOI.empty!

[odow]

x-ref JuliaRegistries/General#127085

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.07%. Comparing base (f476ac3) to head (681942b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
- Coverage   99.07%   99.07%   -0.01%     
==========================================
  Files           9        9              
  Lines         975      974       -1     
==========================================
- Hits          966      965       -1     
  Misses          9        9              

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