Improved #receivedAnswer to not fail if IQ result has no child element.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@9152 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/openfire/user/UserManager.java

@@ -373,6 +373,7 @@ public class UserManager implements IQResultListener {
         // Analyze the disco result packet
         if (IQ.Type.result == packet.getType()) {
             Element child = packet.getChildElement();
+            if (child != null) {
                 for (Iterator it=child.elementIterator("identity"); it.hasNext();) {
                     Element identity = (Element) it.next();
                     String accountType = identity.attributeValue("type");
@@ -382,6 +383,7 @@ public class UserManager implements IQResultListener {
                     }
                 }
             }
+        }
         // Update cache of remote registered users
         remoteUsersCache.put(from.toBareJID(), isRegistered);