Fix sorting columns when a room has no name. (we use '' instead of None)

src/tabs.py

@@ -2354,7 +2354,7 @@ class MucListTab(Tab):
             return
         items = [{'node-part': JID(item[0]).user if JID(item[0]).server == self.name else JID(item[0]).bare,
                   'jid': item[0],
-                  'name': item[2],'users': ''} for item in iq['disco_items'].get_items()]
+                  'name': item[2] or '' ,'users': ''} for item in iq['disco_items'].get_items()]
         self.listview.add_lines(items)
         self.upper_message.set_message('Chatroom list on server %s' % self.name)
         self.upper_message.refresh()

src/windows.py

@@ -1648,7 +1648,6 @@ class ListWin(Win):
           self.lines.sort(key=lambda x: x[col_name],reverse=True)
         self.refresh()
         curses.doupdate()
-        pass                    # TODO
 
     def add_lines(self, lines):
         """