Don't fall on NullPointerException if returned EventUser is null.

code/moya-beans/ejbModule/fi/codecrew/moya/beans/UserBean.java

@@ -1143,10 +1143,12 @@ public class UserBean implements UserBeanLocal {
 		EventUser eventUser = eventUserFacade.findByTokenCode(code);
 
 		// Event mismatch?
-		Integer eventId = eventUser.getEvent().getId();
-		Integer currentEventId = eventBean.getCurrentEvent().getId();
-		if (eventId != currentEventId) {
-			throw new IllegalStateException("Looked up code " + code + " and got EventUser " + eventUser.getId() + " from event " + eventId + " which is not the current event " + currentEventId);
+		if (eventUser != null) {
+			Integer eventId = eventUser.getEvent().getId();
+			Integer currentEventId = eventBean.getCurrentEvent().getId();
+			if (eventId != currentEventId) {
+				throw new IllegalStateException("Looked up code " + code + " and got EventUser " + eventUser.getId() + " from event " + eventId + " which is not the current event " + currentEventId);
+			}
 		}
 
 		return eventUser;