Issue #3131894 by bellenss: Taxonomy term error if It does not exist

bootstrap_barrio.theme

@@ -63,8 +63,10 @@ function bootstrap_barrio_preprocess_html(&$variables) {
     $path_args[0] == 'taxonomy' && $path_args[1] == 'term') {
     $variables['attributes']['class'][] = 'page-taxonomy-term-' . $path_args[2];
     $term = \Drupal::entityTypeManager()->getStorage('taxonomy_term')->load($path_args[2]);
-    $vocabulary_id = $term->bundle();
-    $variables['attributes']['class'][] = 'page-vocabulary-' . Html::cleanCssIdentifier($vocabulary_id);
+    if (!empty($term)) {
+      $vocabulary_id = $term->bundle();
+      $variables['attributes']['class'][] = 'page-vocabulary-' . Html::cleanCssIdentifier($vocabulary_id);
+    }
   }
   $view_id = \Drupal::routeMatch()->getParameter('view_id');
   if ($view_id) {