Check if any product in cart has a certain Category

card_in_cart.php

<?php
function card_in_cart() {
global $woocommerce;

$card_in_cart = false;

foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {
    $_product = $values['data'];
        $terms = get_the_terms( $_product->id, 'product_cat' );

            foreach ($terms as $term) {
                $_categoryid = $term->term_id;
            }

    if ( $_categoryid === 13 ) {
        //a product from 'card' category is in cart!
        $card_in_cart = true;

    }
}

return $card_in_cart;

}

// usage
if(!card_in_cart()) {
	  // show message here
}