Added selected locale if page not root

wagtail/admin/views/chooser.py

@@ -295,6 +295,7 @@ class BrowseView(View):
                     active_locale_id = selected_locale.pk
                 else:
                     active_locale_id = Locale.get_active().pk
+                    selected_locale = get_object_or_404(Locale, id=active_locale_id)
 
                 # we are at the Root level, so get the locales from the current pages
                 choose_url = reverse("wagtailadmin_choose_page")