Preprocessor pager hook missing checks for empty items

Here's a patch to fix the issue

+++ b/ui_suite_bootstrap.theme
@@ -41,11 +41,17 @@ function ui_suite_bootstrap_preprocess_breadcrumb(array &$variables): void {
+  $pages = [];

Could we use

    $pages = LinksSettingType::normalize($variables['items']['pages'] ?? []);

like in the 5.0.x version?

Also please provide a MR instead of patch.

Thanks!

Merging.

Automatically closed - issue fixed for 2 weeks with no activity.