Fixed leaking of Session instances. JM-558

git-svn-id: http://svn.igniterealtime.org/svn/repos/wildfire/trunk@3391 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/wildfire/handler/PresenceUpdateHandler.java

@@ -106,6 +106,11 @@ public class PresenceUpdateHandler extends BasicModule implements ChannelHandler
             else if (Presence.Type.unavailable == type) {
                 broadcastUpdate(presence.createCopy());
                 broadcastUnavailableForDirectedPresences(presence);
+                if (session == null) {
+                    // Recovery logic. Check if a session can be found in the routing table.
+                    session = (ClientSession) XMPPServer.getInstance().getRoutingTable()
+                            .getRoute(presence.getFrom());
+                }
                 if (session != null) {
                     session.setPresence(presence);
                 }