Unmutes the chatroom for a user

def do_unmute(self, sender, body, args):
        """Unmutes the chatroom for a user"""
        if sender.get('MUTED'):
            sender['MUTED'] = False
            self.broadcast('%s has unmuted this chatroom' % (sender['NICK'],))
            for msg in sender.get('QUEUED_MESSAGES', []):
                self.send_message(msg, sender)
            sender['QUEUED_MESSAGES'] = []
        else:
            self.send_message('you were not muted', sender)