OO-1171: check if an end date is available

src/main/java/org/olat/commons/calendar/CalendarUtils.java

@@ -265,7 +265,9 @@ public class CalendarUtils {
 			for ( KalendarRecurEvent recurEvent : lstEvnt ) {
 				periodEvents.add(recurEvent);
 			}
-			if (event.getEnd().before(periodStart) || event.getBegin().after(periodEnd)) continue;
+			if ((event.getEnd() != null && event.getEnd().before(periodStart)) || event.getBegin().after(periodEnd)) {
+				continue;
+			}
 			periodEvents.add(event);
 		}
 		return periodEvents;

src/test/java/org/olat/commons/calendar/ICalFileCalendarManagerTest.java

@@ -123,6 +123,11 @@ public class ICalFileCalendarManagerTest extends OlatTestCase {
 		
 		//persist
 		calManager.persistCalendar(reloadCalWrapper.getKalendar());
+		
+		//an other possible RS
+		Date periodStart = new Date();
+		Date periodEnd = new Date();
+		CalendarUtils.listEventsForPeriod(reloadCalWrapper.getKalendar(), periodStart, periodEnd);
 	}
 	
 	/**