backoffice: display some menu items on empty site (#6726)

tests/test_admin_pages.py

@@ -63,7 +63,11 @@ def teardown_module(module):
     shutil.rmtree(pub.APP_DIR)
 
 def test_empty_site():
-    get_app(pub).get('/backoffice/')
+    resp = get_app(pub).get('/backoffice/')
+    resp = resp.click('Users', index=0)
+    resp = resp.click('New User')
+    resp = get_app(pub).get('/backoffice/')
+    resp = resp.click('Settings', index=0)
 
 def test_with_user():
     create_superuser()

wcs/backoffice/root.py

@@ -557,8 +557,12 @@ class RootDirectory(BackofficeRootDirectory):
 
     def get_menu_items(self):
         if not get_request().user:
-            return []
-        user_roles = set(get_request().user.roles or [])
+            # check if it's not a first connection on an empty site
+            if get_publisher().user_class.count() > 0:
+                return []
+            user_roles = set()
+        else:
+            user_roles = set(get_request().user.roles or [])
         menu_items = []
         backoffice_url = get_publisher().get_backoffice_url()
         if not backoffice_url.endswith('/'):