bug: crash when spec contains external $ref (HTTP/HTTPS URLs)

[Jesus-Vallejo-cloudappi]

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Bug Report

Amazing GitHub Template version:
2.4.0

Current behavior:
When the OpenAPI spec contains $ref pointing to external URLs
(e.g. $ref: 'https://raw.githubusercontent.com/...'), o2p crashes:

TypeError: Cannot read properties of undefined (reading '')
at findObject (refs.js:32)

Expected behavior:
Either support external $ref resolution, or show a clear error message
indicating they are not supported, instead of an unhandled crash.

Steps to reproduce:

1. Use an OpenAPI spec with at least one $ref pointing to an external URL
2. Run o2p with any config
3. o2p crashes before generating any output

Related code:
src/parser/openapi3/refs.js:32

[mels-h]

Fixed in pr: #122