Woocommerce variation override

functions.php

<?php
add_action( 'woocommerce_single_variation', 'woocommerce_single_variation', 10 );
if(!function_exists('woocommerce_single_variation')) {
	function woocommerce_single_variation() {
		echo '<div class="woocommerce-variation single_variation woo_single_variation"></div>';
	}
}