plugin XEP-0334: added a method to add hint directly to elements (i.e. on domish.Element instead of message data)

sat/plugins/plugin_xep_0334.py

@@ -85,10 +85,18 @@ class XEP_0334(object):
         else:
             log.error(u"Unknown hint: {}".format(hint))
 
+    def addHintElements(self, message_elt, hints):
+        """Add hints elements to message stanza
+
+        @param message_elt(domish.Element): stanza where hints must be added
+        @param hints(iterable(unicode)): hints to add
+        """
+        for hint in hints:
+            message_elt.addElement((NS_HINTS, hint))
+
     def _sendPostXmlTreatment(self, mess_data):
         if "hints" in mess_data:
-            for hint in mess_data["hints"]:
-                mess_data[u"xml"].addElement((NS_HINTS, hint))
+            self.addHintElements(mess_data[u"xml"], mess_data[u"hints"])
         return mess_data
 
     def sendMessageTrigger(