torque converter: use same engine speed during dryrun in case no operating point can be found.

VectoCore/VectoCore/Models/SimulationComponent/Impl/TorqueConverter.cs

@@ -232,7 +232,9 @@ namespace TUGraz.VectoCore.Models.SimulationComponent.Impl
 				return operatingPoint;
 			} catch (VectoException ve) {
 				Log.Error(ve, "TorqueConverter: Failed to find operating point for DragPower {0}", engineResponse.DragPower);
-				var engineSpeed = VectoMath.Max(DataBus.EngineIdleSpeed * 1.001, 0.8 * DataBus.EngineSpeed);
+				var engineSpeed = DataBus.DrivingAction == DrivingAction.Brake
+					? DataBus.EngineIdleSpeed * 1.001
+					: VectoMath.Max(DataBus.EngineIdleSpeed * 1.001, 0.8 * DataBus.EngineSpeed);
 
 				var retVal = FindValidTorqueConverterOperatingPoint(
 					absTime, dt, outAngularVelocity, engineSpeed,