Merge pull request #9076 from mattallan/deleted_order_download_permissions

Don't try add new download permissions if order has been deleted

includes/admin/class-wc-admin-post-types.php

@@ -2203,7 +2203,7 @@ class WC_Admin_Post_Types {
 			foreach ( $existing_permissions as $existing_permission ) {
 				$order = wc_get_order( $existing_permission->order_id );
 
-				if ( $order->id ) {
+				if ( ! empty( $order->id ) ) {
 					// Remove permissions
 					if ( ! empty( $removed_download_ids ) ) {
 						foreach ( $removed_download_ids as $download_id ) {