var cart = {};

$.getJSON('goods.json', function (data) {
    var goods = data;
    checkCart();
   showCart();

    function showCart() {
        if ($.isEmptyObject(cart)) { /*--------THIS STRING------ */
            var out = 'Корзина пустая. Добавьте товар в корзину <a href="index.html">главная страница</a>';
            document.getElementById('my-cart').innerHTML = out;
        }
        else {
            var out = '';
            for (var key in cart) {
                out += '<button class="delete" data-art="' +  key  + '" > x </button>';
                out += ' <img src="' + goods[key].image + '" width="48">';
                out += goods[key].name;
                out += ' <button class="minus" data-art="' +  key  + '"> - </button>';
                out += cart[key];
                out += ' <button class="plus" data-art="' +  key  + '"> + </button>';
                out += cart[key] * goods[key].cost;
                out += '<br>';
            }
            document.getElementById('my-cart').innerHTML = out;
            document.querySelectorAll('.plus').forEach(function(but) {
            but.addEventListener("click",plusGoods);
})
            document.querySelectorAll('.minus').forEach(function(but) {
           but.addEventListener("click",minusGoods);
})
            document.querySelectorAll('.delete').forEach(function(but) {
           but.addEventListener("click",deleteGoods);
})
        }
    }