core (xmpp): set missing "from" attribute of received messages to the server domain

src/core/xmpp.py

@@ -114,6 +114,8 @@ class SatMessageProtocol(xmppim.MessageProtocol):
         self.host = host
 
     def onMessage(self, message):
+        if not message.hasAttribute('from'):
+            message['from'] = self.parent.jid.host
         log.debug(_(u"got message from: %s") % message["from"])
         post_treat = defer.Deferred() # XXX: plugin can add their treatments to this deferred