WooCommerce - Customize Cart / Checkout Page No Shipping Methods Available message based on Zip Code.

functions.php

// For Cart Page.
add_filter( 'woocommerce_no_shipping_available_html', 'wf_customize_default_message', 10, 1 );
// For Checkout page
add_filter( 'woocommerce_cart_no_shipping_available_html', 'wf_customize_default_message', 10, 1 );
function wf_customize_default_message( $default_msg ) {
	$zip_array = array(
		'30031',
	);
	
    if ( in_array( WC()->customer->get_shipping_postcode() , $zip_array) ) {
    	$custom_msg = "Call us for quotation - 1-800-XXX-XXXX";
    	if( empty( $custom_msg ) ) {
		  return $default_msg;
		}
		return $custom_msg;
	}
	
	return $default_msg;
}

add_filter('woocommerce_package_rates', 'wf_remove_shipping_options_for_particular_zip_codes', 8, 2);
function wf_remove_shipping_options_for_particular_zip_codes($rates, $package)
{
	global $woocommerce;
	$zip_array = array(
		'30031',
	);
	if ( in_array( $woocommerce->customer->get_shipping_postcode() , $zip_array) ) {
		$rates = array();
	}

	return $rates;
}

What to do if customer is not logged in or address is not configured on registered users profile, in that case shipping calculation doesn't work and shipping message area is shows empty space. How can we address that?