When using viewer.js code in an iframe (`web/viewer.html?file=my.pdf"`) and getting a load error like `Error: file origin does not match viewer's` how do I catch this error?  The console reports `app.js:2140 Uncaught (in promise) Error: file origin does not match viewer's`.  I have setup the load listener and am using the `PDFViewerApplication.initializedPromise`.  I was hoping the `PDFViewerApplication.initializedPromise` would reject, but it does not.  I could not find an eventbus event to listen to specifically for load errors either.

I would like to programmatically detect such load errors and dynamically remove the iframe hosting the pdf viewer and instead replace it with my own error messaging.  I can't figure out how to do that.

Configuration:
- Any, but testing on Chrome 97.0.4692.71 64-bit
- Ubuntu 20.04
- PDF.js version:  v2.12.313
- Is a browser extension: No

Steps to reproduce the problem:
1.  Purposely try to load a PDF in a way that would cause the `app.js:2140 Uncaught (in promise) Error: file origin does not match viewer's` error.
...this.documentInfo,
      baseURL: this.baseUrl,
      filesize: this._contentLength,
      filename: this._docFilename,
      metadata: this.metadata?.getRaw(),
      authors: this.metadata?.get("dc:creator"),
      numPages: this.pagesCount,
      URL: this.url,
    };
  },
  /**
   * A place to fetch data for telemetry after one page is rendered and the
   * viewer is idle.
   * @private
   */
  async _collectTelemetry(pdfDocument) {
    const markInfo = await this.pdfDocument.getMarkInfo();
    if (pdfDocument !== this.pdfDocument) {
      return; 
    }
    const tagged = markInfo?.Marked || false;
    this.externalServices.reportTelemetry({
      type: "tagged",
      tagged,
    });
  },
  /**
   * @private
   */
  async _initializeAutoPrint(pdfDocument, openActionPromise) {