Don't silently swallow ValueError thrown from on_channel_delete.

discord/client.py

@@ -226,9 +226,10 @@ class ConnectionState(object):
             channel = utils.find(lambda c: c.id == channel_id, server.channels)
             try:
                 server.channels.remove(channel)
-                self.dispatch('channel_delete', channel)
             except ValueError:
                 return
+            else:
+                self.dispatch('channel_delete', channel)
 
     def handle_channel_update(self, data):
         server = self._get_server(data.get('guild_id'))