variables are always null

VectoCore/VectoCore/InputData/FileIO/XML/Engineering/Reader/Impl/XMLDriverDataReader.cs

@@ -135,7 +135,7 @@ namespace TUGraz.VectoCore.InputData.FileIO.XML.Engineering.Reader.Impl {
 			var node = GetNode(elementName, required);
 			if (!required && node == null) {
 				try {
-					return creator(null, node);
+					return creator(null, null);
 				} catch (Exception e) {
 					throw new VectoException("Failed to create dummy data provider", e);
 				}

VectoCore/VectoCore/Models/Declaration/FuelData.cs

@@ -75,7 +75,7 @@ namespace TUGraz.VectoCore.Models.Declaration
 			return entries.First();
 		}
 
-		public static Entry Diesel => Instance().Lookup(FuelType.DieselCI, null);
+		public static Entry Diesel => Instance().Lookup(FuelType.DieselCI);
 
 		protected override void ParseData(DataTable table)
 		{