Fix php8.1 deprecated notice

Civi/Inlay/Type.php

@@ -287,7 +287,7 @@ abstract class Type {
     } else {
       $getApi->addWhere('set_name', '=', $setIdentifier);
     }
-    $config = json_decode(($getApi->execute()->first() ?? [])['config'] ?? NULL, TRUE) ?? [];
+    $config = json_decode(($getApi->execute()->first() ?? [])['config'] ?? '[]', TRUE) ?? [];
 
     // Apply and limit keys to the defaults.
     $defaults = $this->getConfigSets()[$schemaName]['defaults'] ?? [];