fix(vue-app): nuxt-link prefetch error on fallback page (#7766)

packages/vue-app/template/components/nuxt-link.client.js

@@ -111,6 +111,7 @@ export default {
       // Preload the data only if not in preview mode
       if (!this.$root.isPreview) {
         const { href } = this.$router.resolve(this.to, this.$route, this.append)
+        if (this.$nuxt)
           this.$nuxt.fetchPayload(href).catch(() => {})
       }
       <% } %>