logic to handle breadcrumbs when deleting a node

modules/tide_site/tide_site.module

@@ -131,7 +131,7 @@ function tide_site_entity_presave(EntityInterface $entity) {
     }
   }
   if ($entity instanceof NodeInterface) {
-    if (!$entity->field_breadcrumb_parent->isEmpty()) {
+    if ($entity->hasField('field_breadcrumb_parent') && !$entity->field_breadcrumb_parent->isEmpty()) {
       $bm = new BreadcrumbCacheDependencyManager();
       $bm->addDependency($entity->id(), $entity->field_breadcrumb_parent->target_id);
       $affected_nodes = $bm->getAllAffectedNodes($entity->id());
@@ -140,6 +140,35 @@ function tide_site_entity_presave(EntityInterface $entity) {
         Cache::invalidateTags($tags);
       }
     }
+    if ($entity->hasField('field_breadcrumb_parent') && $entity->field_breadcrumb_parent->isEmpty()) {
+      try {
+        $entity->set('field_breadcrumb_parent', $entity->field_node_primary_site->entity->field_site_homepage->entity->id());
+        $bm = new BreadcrumbCacheDependencyManager();
+        $bm->addDependency($entity->id(), $entity->field_node_primary_site->entity->field_site_homepage->entity->id());
+        $affected_nodes = $bm->getAllAffectedNodes($entity->id());
+        $tags = $bm->NodeIdsToNodeCacheTags($affected_nodes);
+        if (!empty($tags)) {
+          Cache::invalidateTags($tags);
+        }
+      }catch (\Exception $e) {
+        \Drupal::messenger()->addMessage($e->getMessage());
+      }
+    }
+  }
+}
+
+/**
+ * Implements hook_ENTITY_TYPE_delete().
+ */
+function tide_site_node_delete(NodeInterface $node) {
+  if ($node->hasField('field_breadcrumb_parent')) {
+    $bm = new BreadcrumbCacheDependencyManager();
+    $affected_nodes = $bm->getAllAffectedNodes($node->id());
+    $tags = $bm->NodeIdsToNodeCacheTags($affected_nodes);
+    if (!empty($tags)) {
+      $bm->removeNode($node->id());
+      Cache::invalidateTags($tags);
+    }
   }
 }