message: Fix acces to stylesManager
diff: @@ -748,7 +748,7 @@ export class SurveyModel extends Base
  super();
  var self = this;
  if (typeof document !== "undefined") {
  - this.stylesManager = new StylesManager();
  + SurveyModel.stylesManager = new StylesManager();
  }
  this.createLocalizableString("title", this, true);
  this.createLocalizableString("description", this, true);
  