[Jingle] Sends bad-request when receiving jingle action on unknown content

src/common/jingle_session.py

@@ -459,6 +459,11 @@ class JingleSession(object):
         for content in jingle.iterTags('content'):
             name = content['name']
             creator = content['creator']
+            if (creator, name) not in self.contents:
+                text = 'Content %s (created by %s) does not exist' % (name, creator)
+                self.__send_error(stanza, 'bad-request', text=text, type_='_modify')
+                raise xmpp.NodeProcessed
+            else:
                 cn = self.contents[(creator, name)]
                 cn.on_stanza(stanza, content, error, action)