message: Remove an unneeded line of code
diff: @@ -208,7 +208,6 @@ export class QuestionMatrixBaseModel<TRow, TColumn> extends Question {
  protected clearInvisibleValuesInRows() {
  if (this.isEmpty()) return;
  var newData = Helpers.getUnbindValue(this.value);
  - var visibleRows = this.visibleRows;
  var rows = this.rows;
  for (var i = 0; i < rows.length; i++) {
  var key = rows[i].value;
  