added xml input test file to test nullable component entries

VectoCore/VectoCoreTest/TestData/XML/XMLReaderDeclaration/SchemaVersion2.8/vecto_vehicle-stage_input_only_component_nullable_entries.xml

+<?xml version="1.0" encoding="UTF-8"?><tns:VectoInputDeclaration schemaVersion="2.8" xmlns="urn:tugraz:ivt:VectoAPI:DeclarationDefinitions:DEV:v2.8"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tns="urn:tugraz:ivt:VectoAPI:DeclarationInput:v2.0" xmlns:v2.3="urn:tugraz:ivt:VectoAPI:DeclarationDefinitions:DEV:v2.3"xmlns:v2.0="urn:tugraz:ivt:VectoAPI:DeclarationDefinitions:v2.0"xmlns:di="http://www.w3.org/2000/09/xmldsig#" xsi:schemaLocation="urn:tugraz:ivt:VectoAPI:DeclarationJob E:\VECTO_DEV\fk_vecto-dev\VectoCore\VectoCore\Resources\XSD/VectoDeclarationJob.xsd">
	<v2.0:Vehicle id="VEH-1234567890" xsi:type="InterimStageInputType" >
		<Manufacturer>Some Manufacturer 3</Manufacturer>
		<ManufacturerAddress>Some Manufacturer Address 3</ManufacturerAddress>
		<VIN>VEH-1234567890</VIN>
		<Date>2020-01-09T11:00:00Z</Date>
		<StateOfCompletion>incomplete</StateOfCompletion>
		<ADAS>
			<v2.3:EngineStopStart>true</v2.3:EngineStopStart>
			<v2.3:EcoRollWithoutEngineStop>false</v2.3:EcoRollWithoutEngineStop>
			<v2.3:EcoRollWithEngineStop>true</v2.3:EcoRollWithEngineStop>
			<v2.3:PredictiveCruiseControl>1,2,3</v2.3:PredictiveCruiseControl>			
		</ADAS>
		<Components xsi:type="CompletedVehicleComponentsDeclarationType">
			<Auxiliaries>
				<Data xsi:type="CompletedVehicleAuxiliaryDataDeclarationType">
					<ElectricSystem>
						<LEDLights>
							<Headlights>true</Headlights>
						</LEDLights>
					</ElectricSystem>				
					<HVAC>
						<AuxiliaryHeaterPower>20</AuxiliaryHeaterPower>					
					</HVAC>
				</Data>			
			</Auxiliaries>			
		</Components>
	</v2.0:Vehicle></tns:VectoInputDeclaration>
\ No newline at end of file

VectoCore/VectoXML.spp

@@ -66,6 +66,7 @@
 			<File FilePath="VectoCoreTest\TestData\XML\XMLReaderDeclaration\SchemaVersion2.8\vecto_vehicle-stage_input_full-sample.xml" HomeFolder="Yes"/>
 			<File FilePath="VectoCoreTest\TestData\XML\XMLReaderDeclaration\SchemaVersion2.8\vecto_vehicle-stage_input_only_certain_entries01-sample.xml" HomeFolder="Yes"/>
 			<File FilePath="VectoCoreTest\TestData\XML\XMLReaderDeclaration\SchemaVersion2.8\vecto_vehicle-stage_input_only_certain_entries02-sample.xml" HomeFolder="Yes"/>
+			<File FilePath="VectoCoreTest\TestData\XML\XMLReaderDeclaration\SchemaVersion2.8\vecto_vehicle-stage_input_only_component_nullable_entries.xml" HomeFolder="Yes"/>
 			<File FilePath="VectoCoreTest\TestData\XML\XMLReaderDeclaration\SchemaVersion2.8\vecto_vehicle-stage_input_only_mandatory_entries.xml" HomeFolder="Yes"/>
 		</Folder>
 		<Folder FolderName="Schema Multistage 0.1">