message: Processed change page visibility in progress buttons navigation
diff: @@ -6,6 +6,7 @@ export var progressButtonsComponent: any;
  ko.components.register("survey-progress-buttons", {
  viewModel: function (params: any) {
  var getListElementCss = function(index: any): string {
  + if (index() >= params.model.visiblePages.length) return;
  var elementCss: string = params.model.visiblePages[index()].passed ?
  params.model.css.progressButtonsListElementPassed : "";
  if (params.model.currentPageNo === index()) {
  @@ -15,7 +16,6 @@ ko.components.register("survey-progress-buttons", {
  return elementCss;
  };
  var clickListElement = function(page: PageModel): void {
  - if (params.model['isCompleted']) return;
  if (page.visibleIndex < params.model.currentPageNo) {
  params.model.currentPageNo = page.visibleIndex;
  }
  