only add column on energy consumption of BEV in sum-file if not already present

VectoCore/VectoCore/OutputData/SummaryDataContainer.cs

@@ -325,8 +325,11 @@ namespace TUGraz.VectoCore.OutputData
 				WriteFuelconsumptionEntries(modData, row, vehicleLoading, cargoVolume, passengerCount, runData);
 			} else {
 				if (runData.ElectricMachinesData.Count > 0) {
-					var col = Table.Columns.Add(Fields.ElectricEnergyConsumptionPerKm, typeof(ConvertedSI));
-					col.SetOrdinal(Table.Columns[Fields.CO2_KM].Ordinal);
+					if (!Table.Columns.Contains(Fields.ElectricEnergyConsumptionPerKm)) {
+						var col = Table.Columns.Add(Fields.ElectricEnergyConsumptionPerKm, typeof(ConvertedSI));
+						col.SetOrdinal(Table.Columns[Fields.CO2_KM].Ordinal);
+					}
+
 					row[Fields.ElectricEnergyConsumptionPerKm] =
 						(-modData.TimeIntegral<WattSecond>(ModalResultField.P_battery_terminal) / modData.Distance).Cast<JoulePerMeter>().ConvertToKiloWattHourPerKiloMeter();
 				}