[#1820] Don't switch to simulation plot if "Simulate & Plot" resulted in faulty simulation

swing/src/net/sf/openrocket/gui/simulation/SimulationEditDialog.java

@@ -209,12 +209,10 @@ public class SimulationEditDialog extends JDialog {
 			@Override
 			public void actionPerformed(ActionEvent e) {
 				copyChangesToAllSims();
-				SimulationRunDialog.runSimulations(parentWindow, SimulationEditDialog.this.document, simulationList);
+				SimulationRunDialog dialog = SimulationRunDialog.runSimulations(parentWindow, SimulationEditDialog.this.document, simulationList);
+				if (allowsPlotMode() && dialog.isAllSimulationsSuccessful()) {
 					refreshView();
-				if (allowsPlotMode()) {
 					setPlotMode();
-				} else {
-					setVisible(false);
 				}
 			}
 		});

swing/src/net/sf/openrocket/gui/simulation/SimulationRunDialog.java

@@ -207,9 +207,12 @@ public class SimulationRunDialog extends JDialog {
 	 *            the parent Window of the dialog to use.
 	 * @param simulations
 	 *            the simulations to run.
+	 * @return	  the simulation run dialog instance.
 	 */
-	public static void runSimulations(Window parent, OpenRocketDocument document, Simulation... simulations) {
-		new SimulationRunDialog(parent, document, simulations).setVisible(true);
+	public static SimulationRunDialog runSimulations(Window parent, OpenRocketDocument document, Simulation... simulations) {
+		SimulationRunDialog dialog = new SimulationRunDialog(parent, document, simulations);
+		dialog.setVisible(true);
+		return dialog;
 	}
 
 	private void updateProgress() {
@@ -257,6 +260,18 @@ public class SimulationRunDialog extends JDialog {
 				+ u.toStringUnit(simulationMaxVelocity[index]) + ")");
 	}
 
+	/**
+	 * Returns true if all the simulations ran successfully. Returns false if the simulations encountered
+	 * an exception, or were cancelled.
+	 */
+	public boolean isAllSimulationsSuccessful() {
+		for (SimulationWorker w : simulationWorkers) {
+			if (w.getThrowable() != null)
+				return false;
+		}
+		return true;
+	}
+
 	/**
 	 * A SwingWorker that performs a flight simulation. It periodically updates
 	 * the simulation statuses of the parent class and calls updateProgress().

swing/src/net/sf/openrocket/gui/simulation/SimulationWorker.java

@@ -71,6 +71,17 @@ public abstract class SimulationWorker extends SwingWorker<FlightData, Simulatio
 		return new SimulationListener[0];
 	}
 
+	/**
+	 * Returns the throwable that caused the simulation to fail or cancel,
+	 * or null if the simulation ran successfully.
+	 *
+	 * @return throwable that caused the simulation to fail or cancel,
+	 * 		or null if the simulation ran successfully.
+	 */
+	public Throwable getThrowable() {
+		return throwable;
+	}
+	
 	
 	/**
 	 * Called after a simulation is successfully simulated.  This method is not