ALF-9156 Tweaks to the calendar listing, to return better empty results where needed, and to include the container noderef too

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@29038 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/service/cmr/calendar/CalendarEntry.java

@@ -37,6 +37,11 @@ public interface CalendarEntry extends Serializable, PermissionCheckValue {
     */
    NodeRef getNodeRef();
    
+   /**
+    * @return the NodeRef of the site container this belongs to
+    */
+   NodeRef getContainerNodeRef();
+   
    /**
     * @return the System generated name for the event
     */