Merge branch 'fix-tests-without-async' into gh-3

test/app/routes/show-url.html

@@ -3,7 +3,7 @@
 <script>
 	export default {
 		preload({ url }) {
-			return { url };
+			if (url) return { url };
 		}
 	};
-</script>
+</script>