[96] custom-routes example - links in error.vue page

If you type a url (ex. http://localhost:3000/users/3bogus) that causes the optional validate to return false, it shows the 404 error page as expected. However, nuxt-links in error page is currently throwing exceptions (see console log).

For simple dynamic pages, it transitions despite Vue warn messages in console. For dynamic pages with objects, transition does not happen, as you get undefined property errors.