Remove categories with unknown url_path from breadcrumbs

[jissereitsma]

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.

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[gibkigonzo]

Hey @jissereitsma wdyt about adding changes to formatCategoryLink instead
before:

return config.seo.useUrlDispatcher
  ? ('/' + storeCode + category.url_path)
  : ('/' + storeCode + 'c/' + category.slug)

after:

return config.seo.useUrlDispatcher && category.url_path
  ? ('/' + storeCode + category.url_path)
  : ('/' + storeCode + 'c/' + category.slug)

format /c/:slug is always valid even when we use url_path. If some category will be missing url_path then it will fallback to slug.

[gibkigonzo]

Can you please rebase to branch hotfix/v1.12.1?

[jissereitsma]

@gibkigonzo This should be done now.