WordPress at a glance
action is not described

woocommerce_cart_is_empty action-hook . WC 1.0

Usage

add_action( 'woocommerce_cart_is_empty', 'action_function_name_1590' );
function action_function_name_1590(){
	// action...
}

Where the hook is called

In file: /templates/cart/cart-empty.php
woocommerce_cart_is_empty
woocommerce/templates/cart/cart-empty.php 23
do_action( 'woocommerce_cart_is_empty' );

Where in WP core the hook is used WooCommerce

woocommerce/includes/wc-template-hooks.php 242
add_action( 'woocommerce_cart_is_empty', 'wc_empty_cart_message', 10 );
woocommerce/includes/wc-template-hooks.php 303
add_action( 'woocommerce_cart_is_empty', 'woocommerce_output_all_notices', 5 );