REVERTS issue #2613144 by marcvangend: Field default value does not show in the block

src/Plugin/Block/FieldBlock.php

@@ -368,7 +368,7 @@ class FieldBlock extends BlockBase implements ContainerFactoryPluginInterface {
 
     if ($entity) {
       $field = $entity->get($this->configuration['field_name']);
-      return AccessResult::allowedIf($field->access('view', $account));
+      return AccessResult::allowedIf(!$field->isEmpty() && $field->access('view', $account));
     }
     return AccessResult::forbidden();
   }