bug fix when adding product bundle to cart
bug fix when adding product bundle to cart

The idea is that bundle products should be checked for the sku attribute, since each bundled product has a unique sku. Otherwise, this results in a bug.
pkarw/vue-storefront,pkarw/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront,DivanteLtd/vue-storefront,DivanteLtd/vue-storefront