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.
moreInfoText.push(
          this.l10n.get("error_stack", { stack: moreInfo.stack })
        );
      } else {
        if (moreInfo.filename) {
          moreInfoText.push(
            this.l10n.get("error_file", { file: moreInfo.filename })
          );
        }
        if (moreInfo.lineNumber) {
          moreInfoText.push(
            this.l10n.get("error_line", { line: moreInfo.lineNumber })
          );
        }
      }
    }
    if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
      const errorWrapperConfig = this.appConfig.errorWrapper;
      const errorWrapper = errorWrapperConfig.container;
      errorWrapper.hidden = false;
      const errorMessage = errorWrapperConfig.errorMessage;
      errorMessage.textContent = message;
      const closeButton = errorWrapperConfig.closeButton;
      closeButton.onclick = function () {
        errorWrapper.hidden = true;
      };
      const errorMoreInfo = errorWrapperConfig.errorMoreInfo;
      const moreInfoButton = errorWrapperConfig.moreInfoButton;
      const lessInfoButton = errorWrapperConfig.lessInfoButton;
      moreInfoButton.onclick = function () {