Removed model construction warnings when guard is "false".

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@1831 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/Modules2MTBDD.java

@@ -1447,8 +1447,11 @@ public class Modules2MTBDD
 				guardDDs[l] = JDD.Apply(JDD.TIMES, guardDDs[l], range);
 				// check for false guard
 				if (guardDDs[l].equals(JDD.ZERO)) {
+					// display a warning (unless guard is "false", in which case was probably intentional
+					if (!Expression.isFalse(command.getGuard())) {
 						String s = "\nWarning: Guard for command " + (l+1) + " of module \"" + module.getName() + "\" is never satisfied.\n";
 						mainLog.print(s);
+					}
 					// no point bothering to compute the mtbdds for the update
 					// if the guard is never satisfied
 					upDDs[l] = JDD.Constant(0);