message: Avoid dropping 'undefined' into the HTML in a menu item.
diff: @@ -36,7 +36,7 @@ export class MenuItem extends ThemeableElementBase {
  let iconhtml = "";
  const icon = this.getAttribute("icon");
  - if (icon !== null && icon !== "") {
  + if (icon != null && icon !== "") {
  iconhtml = "<i class='" + icon + "'></i>";
  }
  (<HTMLElement>shadow.querySelector("#" + ID_ICON2)).innerHTML = iconhtml;
  