Set creation_failed flag to True if there's no from in chat creation resposne

Author: mrDoctorWho

extensions/groupchats.py

@@ -345,6 +345,7 @@ def onConfigSet(self, cl, stanza, user):
 frm = stanza.getFrom()
 if not frm:
 logger.critical("no from in stanza! %s", stanza)
+self.creation_failed = True
 return
 chat = frm.getStripped()
 if xmpp.isResultNode(stanza):