[BUG] [Online Generator] silently fails and seemingly does nothing when spec uploaded

Steps to reproduce

1. Go to the online generator (stable or master, same on both)
2. Upload any valid json spec

Expected behavior

Something on the page should change.

If the spec is invalid, it should say so. (It does if you try to upload a yaml spec.)

If the spec is valid, I should get a download popup, or a link saying "click here to generate", or something, anything.

Actual behavior

Nothing happens that the user can see.

In the console there's an error.

There was an issue while parsing the spec  TypeError: (intermediate value).source is undefined
    t http://api.openapi-generator.tech/rapidoc-min.js:181
    _n http://api.openapi-generator.tech/rapidoc-min.js:181
    s http://api.openapi-generator.tech/rapidoc-min.js:181
  rapidoc-min.js:181:67459
 Spec Conversion - Success !!! rapidoc-min.js:181:67544
Unable to resolve the API spec.. a is undefined rapidoc-min.js:181:81881
    loadSpec http://api.openapi-generator.tech/rapidoc-min.js:181

Note that the logs say "Success", immediately after saying failure. So it looks like the error isn't caught properly.

Example spec

{
  "swagger": "2.0",
  "info": {
    "description": "API for demonstrating unit test bug",
    "version": "1.0.0",
    "title": "MWE"
  },
  "host": "example.com",
  "basePath": "/v1",
  "schemes": [
    "http"
  ],
  "paths": {
    "/example": {
      "post": {
        "description": "sample call",
        "operationId": "sample_post",
        "consumes": [
          "application/json"
        ],
        "produces": [
          "application/json"
        ],
        "responses": {
          "201": {
            "description": "pending",
            "schema": {
              "$ref": "#/definitions/example-post-response"
            }
          }
        }
      }
    }
  },
  "definitions": {
    "example-post-response": {
      "type": "object",
      "required": [
        "user"
      ],
      "properties": {
        "user": {
          "type": "string",
          "example": "User A",
          "description": "The user who initiated the request",
          "enum": [
            "User B",
            "User A"
          ]
        }
      }
    }
  }
}

Open the online generator and reproduce the upload with the example JSON while inspecting the browser console and rapidoc-min.js:181. Trace the parsing and spec-loading failure from the reported stack. Done means valid JSON produces visible generation feedback, while invalid input reports an error without contradictory success logging.