Remove dead code has_output and is_dense_output

[drhagen]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.57%. Comparing base (1f02e44) to head (94208c3).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   90.48%   90.57%   +0.09%     
==========================================
  Files          60       60              
  Lines        3162     3151      -11     
  Branches      384      384              
==========================================
- Hits         2861     2854       -7     
+ Misses        219      215       -4     
  Partials       82       82              

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