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.
},
    true
  );
  try {
    webViewerOpenFileViaURL(file);
  } catch (reason) {
    PDFViewerApplication.l10n.get("loading_error").then(msg => {
      PDFViewerApplication._documentError(msg, reason);
    });
  }
}
function webViewerOpenFileViaURL(file) {
  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
    if (file) {
      PDFViewerApplication.open(file);
    } else {
      PDFViewerApplication._hideViewBookmark();
    }
  } else if (PDFJSDev.test("MOZCENTRAL || CHROME")) {
    PDFViewerApplication.setTitleUsingUrl(file,  file);
    PDFViewerApplication.initPassiveLoading();
  } else {
    if (file) {
      throw new Error("Not implemented: webViewerOpenFileViaURL");
    } else {
      PDFViewerApplication._hideViewBookmark();
    }
  }
}
function webViewerPageRendered({ pageNumber, error }) {