How To Search Products By Empty Feature

hi i want search products by empty feature on admin, for eg: my brand feature id 1

i want list products with empty brand feature i try following code but it doesnt work.

any can check ?

in get_products hooks

$join .= db_quote(" LEFT JOIN ?:product_features_values ON ?:product_features_values.product_id = products.product_id AND ?:product_features_values.lang_code = ?s", $lang_code);
$condition .= db_quote(" AND NOT ?:product_features_values.feature_id  = ?i", '1');

Please have a look our addon

Thank you for your suggestion, i have fixed my codes, currently working, but yours addon more effective. If i need another ones i will order your addon