#1770 ignore the ExtraLazyChoiceLoader if the parent $loader is null

Author: vesselind

src/Autocomplete/src/Form/BaseEntityAutocompleteType.php

@@ -38,6 +38,10 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
     public function configureOptions(OptionsResolver $resolver): void
     {
         $choiceLoader = static function (Options $options, $loader) {
+            if (null === $loader) {
+                return null;
+            }
+            
             return new ExtraLazyChoiceLoader($loader);
         };