title: Android Smack XMPP stanza listener : Missing stanza attribute
body: <p>This is stanza that create from api :</p>
  
  <pre><code>&lt;message xmlns="jabber:client" to="+60123333xxx@xxxx.xxxx.my/84947029xxx52245593xxx" from="7xxxa-3cd4-44c6-b5xxxxe5d3@xxxx.xxxx.xxxx.my"&gt;
      &lt;x xmlns="jabber:x:conference" reason="new group chat : mucduke" jid="7xxxa-3cd4-44c6-b5xxxxe5d3@xxxx.xxxx.xxxx.my"&gt;&lt;/x&gt;
      &lt;body&gt;new group chat : mucduke&lt;/body&gt;
  &lt;/message&gt;
  </code></pre>
  
  <p>I use connection.addAsyncStanzaListener(stanzaListener, stanzaFilter) in android to get the stanza but atribute 'reason' and body element if missing from stanza. Can anyone help me why this happen?</p>