*Fixed: PHP Warnings when dealing with empty theme templates.
*Fixed: Themes with highly specialized single-product.php are not being recognized as ‘Product Template file.’.
*Fixed: Performance issues during final WooCommerce checkout.
*Fixed: Incompatibility with Dokan Plugin: Edit product page is not loaded.
*Fixed: PHP notices on constants already defined.
*New: Compatibility with WordPress 4.4 and WooCommerce 2.4.11+