@Override
  @Nullable
  protected String validate(int index) {
    if (myRulesModel.getSize() < index) {
      return null;
    }

    if (mySectionRuleManager != null) {
      final ArrangementSectionRuleManager.ArrangementSectionRuleData data = extractSectionText(index);
      if (data != null) {
        return validateSectionRule(data, index);
      }
    }
    return super.validate(index);
  }
@Override
  @Nullable
  protected String validate(int index)