Interval iteration: Only print max finite value if it actually exists

prism/src/explicit/DTMCModelChecker.java

@@ -2137,7 +2137,9 @@ public class DTMCModelChecker extends ProbModelChecker
 		}
 
 		double max_v = PrismUtils.findMaxFinite(rv.soln, unknownStates.iterator());
+		if (max_v != Double.NEGATIVE_INFINITY) {
 			mainLog.println("Maximum finite value in solution vector at end of interval iteration: " + max_v);
+		}
 
 		return rv;
 	}

prism/src/explicit/MDPModelChecker.java

@@ -2508,7 +2508,9 @@ public class MDPModelChecker extends ProbModelChecker
 		}
 
 		double max_v = PrismUtils.findMaxFinite(rv.soln, unknownStates.iterator());
+		if (max_v != Double.NEGATIVE_INFINITY) {
 			mainLog.println("Maximum finite value in solution vector at end of interval iteration: " + max_v);
+		}
 
 		return rv;
 	}

prism/src/prism/NondetModelChecker.java

@@ -2567,8 +2567,10 @@ public class NondetModelChecker extends NonProbModelChecker
 
 		if (doIntervalIteration) {
 			double max_v = rewards.maxFiniteOverBDD(maybe);
+			if (max_v != Double.NEGATIVE_INFINITY) {
 				mainLog.println("Maximum finite value in solution vector at end of interval iteration: " + max_v);
 			}
+		}
 
 		// derefs
 		JDD.Deref(inf);

prism/src/prism/ProbModelChecker.java

@@ -2363,8 +2363,10 @@ public class ProbModelChecker extends NonProbModelChecker
 
 		if (doIntervalIteration) {
 			double max_v = rewards.maxFiniteOverBDD(maybe);
+			if (max_v != Double.NEGATIVE_INFINITY) {
 				mainLog.println("Maximum finite value in solution vector at end of interval iteration: " + max_v);
 			}
+		}
 
 		// derefs
 		JDD.Deref(inf);