Bugfix: digital clocks from GUI throws errors when it should not.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@2383 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/PrismCL.java

@@ -645,8 +645,7 @@ public class PrismCL
 
 		// check for deadlocks
 		states = model.getDeadlockStates();
-		if (states != null) {
-			if (states.size() > 0) {
+		if (states != null && states.size() > 0) {
 			// for pta models (via digital clocks)
 			if (digital) {
 				// by construction, these can only occur from timelocks
@@ -674,7 +673,6 @@ public class PrismCL
 				exit();
 			}
 		}
-		}
 
 		// print more model info
 		mainLog.println();

prism/src/userinterface/properties/GUIExperiment.java

@@ -411,7 +411,7 @@ public class GUIExperiment
 									clear = false;
 									// by construction, deadlocks can only occur from timelocks
 									StateList states = model.getDeadlockStates();
-									if (states != null) {
+									if (states != null && states.size() > 0) {
 										throw new PrismException("Timelock in PTA, e.g. in state (" + states.getFirstAsValues() + ")");
 									}
 									// print some model info

prism/src/userinterface/properties/computation/ModelCheckThread.java

@@ -147,7 +147,7 @@ public class ModelCheckThread extends GUIComputationThread
 					clear = false;
 					// by construction, deadlocks can only occur from timelocks
 					StateList states = model.getDeadlockStates();
-					if (states != null) {
+					if (states != null && states.size() > 0) {
 						throw new PrismException("Timelock in PTA, e.g. in state (" + states.getFirstAsValues() + ")");
 					}
 					// print some model info