Retarder: changed from exception to switch-case

VectoCore/VectoCore/InputData/FileIO/JSON/JSONVehicleData.cs

@@ -150,17 +150,13 @@ namespace TUGraz.VectoCore.InputData.FileIO.JSON
 			get
 			{
 				var retarderType = Body.GetEx(JsonKeys.Vehicle_Retarder).GetEx<string>(JsonKeys.Vehicle_Retarder_Type);
-				try {
-					return retarderType.ParseEnum<RetarderType>();
-				} catch (Exception) {
-					switch (retarderType.ToLower()) {
+				switch (retarderType.ToLowerInvariant()) {
 					case "primary":
 						return RetarderType.TransmissionInputRetarder;
 					case "secondary":
 						return RetarderType.TransmissionOutputRetarder;
 					default:
-							throw new VectoException("Unknown retarder type {0}", retarderType);
-					}
+						return retarderType.ParseEnum<RetarderType>();
 				}
 			}
 		}