message: fix(action-bar): Don't remove action items twice.
  turned action items into views and they
  can get removed as a part of the view detach process -- think
  *ngIf templates.
diff: @@ -83,9 +83,11 @@ export class ActionBarScope { // tslint:disable-line:component-class-suffix
  }
  public onActionDestroy(item: ActionItemDirective) {
  + if (item.element.nativeElement.actionBar) {
  this.page.actionBar.actionItems.removeItem(item.element.nativeElement);
  }
  }
  +}
  @Directive({
  selector: "ActionItem" // tslint:disable-line:directive-selector
  