fix(gen): properly handle named response with multiple contents

[tdakkota]

Fixes #1220

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.80%. Comparing base (d2fbe82) to head (fbe6d9e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1223   +/-   ##
=======================================
  Coverage   73.80%   73.80%           
=======================================
  Files         189      189           
  Lines       12762    12762           
=======================================
  Hits         9419     9419           
  Misses       2802     2802           
  Partials      541      541           

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