Issue #3204267 by christophe.klein: Warning: Invalid argument supplied for...

Issue #3204267 by christophe.klein: Warning: Invalid argument supplied for foreach() in bootstrap_barrio_preprocess_status_messages() (line 633 of bootstrap_barrio.theme)

bootstrap_barrio.theme

@@ -602,8 +602,10 @@ function bootstrap_barrio_theme_suggestions_status_messages_alter(array &$sugges
  */
 function bootstrap_barrio_preprocess_status_messages(&$variables) {
   $variables['title_ids'] = [];
-  foreach ($variables['message_list'] as $message_type => $messages) {
-    $variables['title_ids'][$message_type] = Html::getUniqueId("message-$message_type-title");
+  if (is_countable($variables['message_list']) && count($variables['message_list'])) {
+    foreach ($variables['message_list'] as $message_type => $messages) {
+      $variables['title_ids'][$message_type] = Html::getUniqueId("message-$message_type-title");
+    }
   }
 }