message: add isLibraryLoaded function into customWidget:
diff: @@ -12,14 +12,18 @@ export class QuestionCustomWidget {
  if (this.widgetJson.willUnmount) this.widgetJson.willUnmount(question, el);
  }
  public isFit(question: IQuestion): boolean {
  - if (this.widgetJson.isFit) return this.widgetJson.isFit(question);
  + if (this.isLibraryLoaded() && this.widgetJson.isFit) return this.widgetJson.isFit(question);
  return false;
  }
  public activatedByChanged(activatedBy: string) {
  - if(this.widgetJson.activatedByChanged) {
  + if(this.isLibraryLoaded() && this.widgetJson.activatedByChanged) {
  this.widgetJson.activatedByChanged(activatedBy);
  }
  }
  + private isLibraryLoaded(): boolean {
  + if(this.widgetJson.widgetIsLoaded) return this.widgetJson.widgetIsLoaded() == true;
  + return true;
  + }
  public get isDefaultRender() : boolean { return this.widgetJson.isDefaultRender; }
  }
  