Return any string value when the server sends a challenge to the client.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2816 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smack/sasl/SASLAnonymous.java

@@ -45,7 +45,8 @@ public class SASLAnonymous extends SASLMechanism {
     }
 
     protected String getChallengeResponse(byte[] bytes) {
-        // Return null since this mechanism will never get a challenge from the server
-        return null;
+        // Some servers may send a challenge to gather more information such as
+        // email address. Return any string value.
+        return "anything";
     }
 }