fix(gen): handle path parameters with unsupported content correctly

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #339 (9d881fb) into main (4cb0388) will decrease coverage by 0.09%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
- Coverage   68.12%   68.02%   -0.10%     
==========================================
  Files         123      123              
  Lines        8203     8207       +4     
==========================================
- Hits         5588     5583       -5     
- Misses       2261     2267       +6     
- Partials      354      357       +3     

Impacted Files	Coverage Δ
gen/gen_parameters.go	52.30% <80.00%> (+1.51%)	⬆️
openapi/parser/parse_components.go	91.89% <0.00%> (-8.11%)	⬇️
jsonschema/parser.go	80.12% <0.00%> (-1.90%)	⬇️

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