Remove categories with unknown `url_path` from breadcrumbs
Remove categories with unknown `url_path` from breadcrumbs

In already 4 instances of Vue Storefront 1 with Magento 1, I've encountered the following issue: When categories are loaded into the breadcrumbs, they include the Magento Root Category (often with a name like **Default Category**). But because this Root Category serves a special purpose, the URL path is always empty. This fix simply checks whether the URL path is `undefined` and if so, it skips that category. Because the breadcrumbs are supposed to only contain categories with the URL path set.
pkarw/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront,DivanteLtd/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront