Look for the QuickReply layer's slug into available choices.

def _rank_qr(self, choices):
        """
        Look for the QuickReply layer's slug into available choices.
        """
        from bernard.platforms.facebook import layers as fbl

        try:
            qr = self.request.get_layer(fbl.QuickReply)
            self.chosen = choices[qr.slug]
            self.slug = qr.slug

            if self.when is None or self.when == qr.slug:
                return 1.0
        except KeyError:
            pass