Merge branch 'xanf-fix-router-v2' into 'master'

Add default configuration to VueRouter compat

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/128544



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Illya Klymov <xanf@xanf.me>
Co-authored-by: Illya <iklymov@gitlab.com>

app/assets/javascripts/lib/utils/vue3compat/vue_router.js

@@ -67,7 +67,16 @@ const transformers = {
 
 const transformOptions = (options = {}) => {
   const defaultConfig = {
-    routes: [],
+    routes: [
+      {
+        path: '/',
+        component: {
+          render() {
+            return '';
+          },
+        },
+      },
+    ],
     history: createWebHashHistory(),
   };
   return Object.keys(options).reduce((acc, key) => {