Display a notice on the settings page if there are no Shipping Zones yet

wc_csp_check_shipping_zones.php

function wc_csp_check_shipping_zones(){
	
	global $current_screen;
	$screen = get_current_screen();
	$screen_id = $screen ? $screen->id : '';
	if ( $screen_id == 'woocommerce_page_wc-settings'){
		$zones = WC_Shipping_Zones::get_zones();
		if ( empty($zones) ) {
	         echo '<div class="notice notice-warning is-dismissible">
	             <p>It appears that your store does not have any Shipping Zones yet. Before setting up Shipping Methods Restrictions, it will be necessary to create Shipping Zones with all available Shipping Methods. <a href="https://docs.woocommerce.com/document/setting-up-shipping-zones/">Learn more here</a>
				 </p>
	         </div>';
    	}
    }
}
add_action('admin_notices', 'wc_csp_check_shipping_zones');