Fix bug when value is zero

Author: cesarBLG

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/Brakes/MSTS/AirSinglePipe.cs

@@ -358,7 +358,7 @@ public void UpdateTripleValveState(float elapsedClockSeconds)
             if ((Car as MSTSWagon).DistributorPresent)
             {
                 float targetPressurePSI = (ControlResPressurePSI - BrakeLine1PressurePSI) * AuxCylVolumeRatio;
-                if (targetPressurePSI > AutoCylPressurePSI && (prevBrakePipePressurePSI - BrakeLine1PressurePSI) > Math.Max(elapsedClockSeconds, 0.0001f) * EmergencyValveActuationRatePSIpS)
+                if (targetPressurePSI > AutoCylPressurePSI && EmergencyValveActuationRatePSIpS > 0 && (prevBrakePipePressurePSI - BrakeLine1PressurePSI) > Math.Max(elapsedClockSeconds, 0.0001f) * EmergencyValveActuationRatePSIpS)
                     TripleValveState = ValveState.Emergency;
                 else if (targetPressurePSI < AutoCylPressurePSI - (TripleValveState != ValveState.Release ? 2.2f : 0f)
                     || targetPressurePSI < 2.2f) // The latter is a UIC regulation (0.15 bar)
@@ -370,7 +370,7 @@ public void UpdateTripleValveState(float elapsedClockSeconds)
             }
             else
             {
-                if (BrakeLine1PressurePSI < AuxResPressurePSI - 1 && (prevBrakePipePressurePSI - BrakeLine1PressurePSI) > Math.Max(elapsedClockSeconds, 0.0001f) * EmergencyValveActuationRatePSIpS)
+                if (BrakeLine1PressurePSI < AuxResPressurePSI - 1 && EmergencyValveActuationRatePSIpS > 0 && (prevBrakePipePressurePSI - BrakeLine1PressurePSI) > Math.Max(elapsedClockSeconds, 0.0001f) * EmergencyValveActuationRatePSIpS)
                     TripleValveState = ValveState.Emergency;
                 else if (BrakeLine1PressurePSI > AuxResPressurePSI + 1)
                     TripleValveState = ValveState.Release;