message: Prevert dragging embedded viewers if they have no content
diff: @@ -575,7 +575,7 @@ export class EmbeddedViewer extends ViewerElement implements CommandPaletteReque
  ev.stopPropagation();
  const target = <HTMLElement>ev.target;
  - if (target.getAttribute("draggable") === null) {
  + if (target.getAttribute("draggable") == null || this.getViewerElement() == null) {
  ev.preventDefault();
  return;
  }
  