Minor filter fix

git-svn-id: https://plugins.svn.wordpress.org/excel-like-product-manager-for-woocommerce-and-wp-e-commerce/trunk@920277 b8457f37-d9ea-0310-8a92-e5e31aec5664
Minor filter fix [a]

git-svn-id: https://plugins.svn.wordpress.org/excel-like-product-manager-for-woocommerce-and-wp-e-commerce/trunk@920278 b8457f37-d9ea-0310-8a92-e5e31aec5664