Fixed alias_attributes handling

Author: Wi3ard

main.tf

@@ -19,7 +19,7 @@ resource "aws_cognito_user_pool" "user_pool" {
   count = var.module_enabled ? 1 : 0
 
   name                     = var.name
-  alias_attributes         = local.alias_attributes
+  alias_attributes         = var.alias_attributes != null ? var.alias_attributes : local.alias_attributes
   username_attributes      = var.username_attributes
   auto_verified_attributes = var.auto_verified_attributes