Issue #3502916 by just_like_good_vibes: Undefined array key(s) in...

Issue #3502916 by just_like_good_vibes: Undefined array key(s) in Drupal\ui_patterns\Plugin\Derivative\EntityFieldSourceDeriverBase

src/Plugin/Derivative/EntityFieldSourceDeriverBase.php

@@ -319,7 +319,7 @@ abstract class EntityFieldSourceDeriverBase extends DeriverBase implements Conta
       if (!$fields_metadata[$entity_type_id]["fieldable"]) {
         continue;
       }
-      $entity_field_map = $all_entity_field_map[$entity_type_id];
+      $entity_field_map = $all_entity_field_map[$entity_type_id] ?? NULL;
       if (!is_array($entity_field_map)) {
         continue;
       }
@@ -413,7 +413,7 @@ abstract class EntityFieldSourceDeriverBase extends DeriverBase implements Conta
       ->setRequired()
       ->setLabel((string) ($entity_type_fields_data["label"] ?? ""));
     // Derive when bundle is unknown (in views for example)
-    foreach ($entity_type_fields_data["field_storages"] as $field_name => $field_storage_data) {
+    foreach (($entity_type_fields_data["field_storages"] ?? []) as $field_name => $field_storage_data) {
       if (!isset($field_storage_data["label"])) {
         // During site install $field_storage_data is not setup completed.
         // Skip for now.