Fix bug #1031277, exception in some Topic commands when trying to modify a

topic in a channel that the bot is not in.

plugins/Topic.py

@@ -142,7 +142,10 @@ class Topic(callbacks.Privmsg):
         irc.queueMsg(ircmsgs.topic(channel, newTopic))
 
     def _canChangeTopic(self, irc, channel):
-        c = irc.state.channels[channel]
+        try:
+            c = irc.state.channels[channel]
+        except KeyError:
+            irc.error('I\'m not currently in %s.' % channel, Raise=True)
         if irc.nick not in c.ops and 't' in c.modes:
             irc.error('I can\'t change the topic, I\'m not opped and %s '
                       'is +t.' % channel, Raise=True)

test/test_Topic.py

@@ -58,6 +58,7 @@ class TopicTestCase(ChannelPluginTestCase, PluginDocumentation):
         m = self.getMsg('topic add bar')
         self.assertEqual(m.command, 'TOPIC')
         self.assertEqual(m.args[0], self.channel)
+        self.assertError('topic add #floorgle')
 
     def testChange(self):
         _ = self.getMsg('topic add foo')