message: Fix the Creator tests on disposing survey
diff: import * as ko from "knockout";
  import { PageModel } from "survey-core";
  -import { PanelModelBase, PanelModel, QuestionRowModel, Question, doKey2ClickUp } from "survey-core";
  +import { PanelModelBase, PanelModel, QuestionRowModel, Question, Base, doKey2ClickUp } from "survey-core";
  import { Serializer } from "survey-core";
  import { SurveyElement, IElement } from "survey-core";
  import { ElementFactory } from "survey-core";
  @@ -35,6 +35,7 @@ export class QuestionRow extends QuestionRowModel {
  var el = SurveyElement.GetFirstNonTextElement(elements);
  if (!el) return;
  var element = <IElement>con;
  + if((<Base><any>element).isDisposed) return;
  if (element.isPanel && this.panel.survey) {
  this.panel.survey.afterRenderPanel(con, el);
  } else {
  