Small bug fix: missing err msg in GUI simulator.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@7180 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/userinterface/simulator/GUISimulator.java

@@ -1785,6 +1785,7 @@ public class GUISimulator extends GUIPlugin implements MouseListener, ListSelect
 				} catch (NumberFormatException nfe) {
 					String msg = "The \"" + typeExploreCombo.getSelectedItem() + "\" parameter is invalid: ";
 					msg += "it should be greater than " + currentTime;
+					throw new PrismException(msg);
 				}
 			}