conditional parameter api call flutter

 Future getUserDashboard(
    String status,
    String farmType,
    String farmCategory,
    String dateRange,
  ) async {
    try {
      Map<String, String> params;
      if (dateRange.isNotEmpty) {
        params = {
          "status": status,
          "farm_type": farmType,
          "farm_category": farmCategory,
          "date_range": dateRange,
        };
      } else {
        params = {
          "status": status,
          "farm_type": farmType,
          "farm_category": farmCategory,
        };
      }
      final response = await getDio()!.get(
        ApiUrl.homeUserDashboard,
        queryParameters: params,
      );
      _userDashboardResponse = UserDashboaredResponse.fromJson(response.data);
      notifyListeners();
    } on DioException catch (e) {
      _resMessage = e.message.toString();
      Log().printError(_resMessage);
      notifyListeners();
      Log().showMessageToast(message: AppInterceptors.handleError(e));
    }
  }