From fbe77866c556f90978a04c05fb7448e712d31a04 Mon Sep 17 00:00:00 2001
From: Gaston Dombiak <gaston@jivesoftware.com>
Date: Tue, 13 Sep 2005 19:43:22 +0000
Subject: [PATCH] Allow to send empty responses.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2815 b35dd754-fafc-0310-a699-88a17e54d16e
---
 source/org/jivesoftware/smack/sasl/SASLMechanism.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source/org/jivesoftware/smack/sasl/SASLMechanism.java b/source/org/jivesoftware/smack/sasl/SASLMechanism.java
index d42375f4e..2b775456a 100644
--- a/source/org/jivesoftware/smack/sasl/SASLMechanism.java
+++ b/source/org/jivesoftware/smack/sasl/SASLMechanism.java
@@ -79,7 +79,9 @@ public abstract class SASLMechanism {
         StringBuffer stanza = new StringBuffer();
         stanza.append("<response xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
         String authenticationText = getChallengeResponse(StringUtils.decodeBase64(challenge));
-        stanza.append(StringUtils.encodeBase64(authenticationText));
+        if (authenticationText != null) {
+            stanza.append(StringUtils.encodeBase64(authenticationText));
+        }
         stanza.append("</response>");
 
         // Send the authentication to the server