test: forgot to add props in return to test

Author: ericapisani

demos/default/pages/getStaticProps/with-revalidate-404.js

@@ -13,6 +13,7 @@ const Show = () => (
 export async function getStaticProps(context) {
   const time = new Date().getMinutes() % 10 < 5
   return {
+    props: {},
     redirect: time ? { destination: '/404', permanent: false} : undefined
   }