Fixed NPE when TO was not included in IQ packet. JM-439

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@2975 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/messenger/handler/IQLastActivityHandler.java

@@ -38,7 +38,7 @@ public class IQLastActivityHandler extends IQHandler implements ServerFeaturesPr
         IQ reply = IQ.createResultIQ(packet);
         Element lastActivity = reply.setChildElement("query", "jabber:iq:last");
         String sender = packet.getFrom().getNode();
-        String username = packet.getTo().getNode();
+        String username = packet.getTo() == null ? null : packet.getTo().getNode();
 
         // Check if any of the usernames is null
         if (sender == null || username == null) {