fix: print pretty error for external references

[tdakkota]

No description provided.

[codecov]

Codecov Report

Base: 73.77% // Head: 73.82% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (a848dac) compared to base (f6e7169).
Patch coverage: 82.71% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #637      +/-   ##
==========================================
+ Coverage   73.77%   73.82%   +0.04%     
==========================================
  Files         169      169              
  Lines       11699    11751      +52     
==========================================
+ Hits         8631     8675      +44     
- Misses       2622     2628       +6     
- Partials      446      448       +2     

Impacted Files	Coverage Δ
gen/options.go	16.66% <ø> (ø)
jsonschema/parser_settings.go	77.77% <ø> (ø)
openapi/parser/settings.go	100.00% <ø> (ø)
jsonschema/resolve.go	62.50% <48.00%> (-2.89%)	⬇️
openapi/parser/resolve.go	89.14% <51.61%> (-1.51%)	⬇️
jsonschema/parser.go	83.42% <73.33%> (+0.13%)	⬆️
internal/location/error.go	72.61% <75.67%> (+5.95%)	⬆️
internal/location/position.go	78.35% <80.00%> (ø)
gen/errors.go	64.28% <100.00%> (ø)
gen/gen_contents.go	72.88% <100.00%> (ø)
... and 27 more

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