def fail(self, cmd, title=None, message=None):
        """Send back captured exceptions"""
        if message is None:
            message = self.handle_exc()
        else:
            message = escape(message)
        self.db.send(
            'Echo|%s' % dump({
                'for': escape(title or '%s failed' % cmd),
                'val': message
            })
        )
Send back captured exceptions