Bug fix: pre-strategy generation check done before model construction.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@8072 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/Prism.java

@@ -2706,6 +2706,10 @@ public class Prism extends PrismComponent implements PrismSettingsListener
 				setEngine(Prism.EXPLICIT);
 			}
 		}
+		try {
+			// Build model, if necessary
+			buildModelIfRequired();
+
 			// Compatibility check
 			if (genStrat && currentModelType.nondeterministic() && !getExplicit()) {
 				if (!((NondetModel) currentModel).areAllChoiceActionsUnique())
@@ -2714,10 +2718,6 @@ public class Prism extends PrismComponent implements PrismSettingsListener
 							+ "Either switch to the explicit engine or add more action labels to the model");
 			}
 
-		try {
-			// Build model, if necessary
-			buildModelIfRequired();
-
 			// Create new model checker object and do model checking
 			if (!getExplicit()) {
 				ModelChecker mc = createModelChecker(propertiesFile);