feat(gen): avoid empty response types (part 3)

[tdakkota]

Replaces #670.

[codecov]

Codecov Report

Base: 74.30% // Head: 74.31% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (af48d1e) compared to base (ad15ce2).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #724      +/-   ##
==========================================
+ Coverage   74.30%   74.31%   +0.01%     
==========================================
  Files         176      176              
  Lines       12721    12748      +27     
==========================================
+ Hits         9452     9474      +22     
- Misses       2786     2789       +3     
- Partials      483      485       +2     

Impacted Files	Coverage Δ
gen/ir/operation.go	82.85% <88.88%> (+1.44%)	⬆️
gen/gen_contents.go	74.26% <0.00%> (-0.74%)	⬇️

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