[Bug #1175] Fix bug

Availability was not averaged for low zoom levels (month and
year). This caused the overload to not be shown.

FEA: ItEr75S04BugFixing

navalplanner-webapp/src/main/java/org/navalplanner/web/planner/chart/StandardLoadChartFiller.java

@@ -67,7 +67,7 @@ public abstract class StandardLoadChartFiller extends LoadChartFiller {
 
     private SortedMap<LocalDate, EffortDuration> getCalendarMaximumAvailability(
             ILoadChartData data) {
-        return data.getAvailability();
+        return groupAsNeededByZoom(data.getAvailability());
     }
 
 }