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.
];
  validateFileURL = function (file) {
    if (file === undefined) {
      return;
    }
    try {
      const viewerOrigin = new URL(window.location.href).origin || "null";
      if (HOSTED_VIEWER_ORIGINS.includes(viewerOrigin)) {
        
        return;
      }
      const { origin, protocol } = new URL(file, window.location.href);
      
      
      
      
      
      
      if (origin !== viewerOrigin && protocol !== "blob:") {
        throw new Error("file origin does not match viewer's");
      }
    } catch (ex) {
      PDFViewerApplication.l10n.get("loading_error").then(msg => {
        PDFViewerApplication._documentError(msg, { message: ex?.message });
      });
      throw ex;
    }
  };
}
async function loadFakeWorker() {