made output of TypeApprovalNumber optional

VectoCore/VectoCore/OutputData/XML/DeclarationReports/CustomerInformationFile/CustomerInformationFile_0_9/CIFWriter/VehicleGroups.cs

@@ -7,6 +7,7 @@ using System.Xml.Linq;
 using TUGraz.VectoCommon.InputData;
 using TUGraz.VectoCommon.Models;
 using TUGraz.VectoCommon.Resources;
+using TUGraz.VectoCommon.Utils;
 using TUGraz.VectoCore.OutputData.XML.DeclarationReports.ManufacturerReport.ManufacturerReport_0_9.ManufacturerReportGroupWriter;
 using TUGraz.VectoCore.Utils;
 
@@ -76,7 +77,12 @@ namespace TUGraz.VectoCore.OutputData.XML.DeclarationReports.CustomerInformation
 				new XElement(_cif + XMLNames.Component_Manufacturer, vehicleData.Manufacturer),
 				new XElement(_cif + XMLNames.Component_ManufacturerAddress, vehicleData.ManufacturerAddress),
 				new XElement(_cif + XMLNames.Component_Model, vehicleData.Model),
-				new XElement(_cif + XMLNames.VehicleTypeApprovalNumber, vehicleData.VehicleTypeApprovalNumber),
+				!vehicleData.VehicleTypeApprovalNumber.IsNullOrEmpty() 
+					? new XElement(_cif + XMLNames.VehicleTypeApprovalNumber, vehicleData.VehicleTypeApprovalNumber)
+					: null,
+				//new XElement(_cif + XMLNames.VehicleTypeApprovalNumber, !vehicleData.VehicleTypeApprovalNumber.IsNullOrEmpty() 
+				//	? vehicleData.VehicleTypeApprovalNumber 
+				//	: null),
 				new XElement(_cif + XMLNames.CorrectedActualMass, vehicleData.CurbMassChassis.ValueAsUnit("kg")),
 				new XElement(_cif + XMLNames.Vehicle_VocationalVehicle, vehicleData.VocationalVehicle),
 				new XElement(_cif + XMLNames.Vehicle_SleeperCab, vehicleData.SleeperCab),
@@ -233,7 +239,7 @@ namespace TUGraz.VectoCore.OutputData.XML.DeclarationReports.CustomerInformation
 																+ consolidatedVehicle.NumberPassengerSeatsUpperDeck 
 																+ consolidatedVehicle.NumberPassengersStandingLowerDeck 
 																+ consolidatedVehicle.NumberPassengersStandingUpperDeck),
-				consolidatedVehicle.VehicleTypeApprovalNumber != null ? new XElement(_cif + XMLNames.VehicleTypeApprovalNumber, consolidatedVehicle.VehicleTypeApprovalNumber) : null
+				!consolidatedVehicle.VehicleTypeApprovalNumber.IsNullOrEmpty() ? new XElement(_cif + XMLNames.VehicleTypeApprovalNumber, consolidatedVehicle.VehicleTypeApprovalNumber) : null
 			});
 
 			return result;