NondetModelChecker.checkExpressionMultiObjective(): BDD cleanup when computeMultiReachProbs throws Exception

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11800 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/NondetModelChecker.java

@@ -643,10 +643,12 @@ public class NondetModelChecker extends NonProbModelChecker
 			modelProduct.trans01 = tmptrans01;
 		}
 
+		Object value;
+		try {
 			// Do multi-objective computation
-		Object value = mcMo.computeMultiReachProbs(modelProduct, mcLtl, transRewardsListProduct, modelProduct.getStart(), targetDDs, multitargetDDs, multitargetIDs, opsAndBounds,
+			value = mcMo.computeMultiReachProbs(modelProduct, mcLtl, transRewardsListProduct, modelProduct.getStart(), targetDDs, multitargetDDs, multitargetIDs, opsAndBounds,
 			                                    conflictformulae > 1);
-		
+		} finally {
 			// Deref, clean up
 			if (ddStateIndex != null)
 				JDD.Deref(ddStateIndex);
@@ -663,6 +665,7 @@ public class NondetModelChecker extends NonProbModelChecker
 			if (multitargetDDs != null)
 				for (JDDNode t : multitargetDDs)
 					JDD.Deref(t);
+		}
 
 		if (value instanceof TileList) {
 			if (opsAndBounds.numberOfNumerical() == 2) {