wc-hide-read-more-button-out-of-stock.php

if ( ! function_exists( 'woocommerce_template_loop_add_to_cart' ) ) {
	/**
	 * Hide loop read more buttons for out of stock items.
	 */
	function woocommerce_template_loop_add_to_cart() {
		global $product;
		if ( ! $product->is_in_stock() || ! $product->is_purchasable() ) {
			return;
		}
		wc_get_template( 'loop/add-to-cart.php' );
	}
}