When a dashboard fails to load, the publication dashboard should prompt for a new URL

[rickmcgeer]

We had this built in, but it's essentially defunct.

[rickmcgeer]

Now revived, but there are issues

In PublishedDashboard.init(), the following code is now added:

  if (url) {
      const valid = await this.loadDashboardFromURL(url);
      if (!valid) {
        this._initURLPrompt_(url);
      }
    } else {
      this._initURLPrompt_(null);
    }

And _initUrlPrompt_ is:

_initURLPrompt_ (url, message) {
    if (message) {
      $world.inform(message);
    }
    const loadDialog = part(LoadDialog);
    loadDialog.init(this, url);
    loadDialog.openInWorld();
  }

See:

$world.execCommand("open browser", {moduleName: "publication/dashboard.js", packageName: "galyleo-dashboard", });

LoadDialog and LoadDialogMorph are in dashboard.cp.js, but the bindings to the button events seem non-functional. @merryman, can you take a look?

$world.execCommand("open browser", {moduleName: "studio/dashboard.cp.js", packageName: "galyleo-dashboard", codeEntity: "LoadDialog"});