fix negative amount of prodcut in shopping cart

app/Cart.php

@@ -50,7 +50,7 @@ class Cart /*extends Model*/
     public function updateQty($products_qty)
     {
         foreach ($products_qty as $id => $qty) {
-            if (!$qty) {
+            if ($qty <= 0) {
                 $this->removeItem($id);
             } else {
                 $this->items[$id]['qty'] = (int)$qty;

resources/views/cart.blade.php

@@ -76,6 +76,7 @@
                                 <td>€ {{ $product['item']->price }}</td>
                                 <td>
                                     <input type="number"
+                                           min="0"
                                            class="js-qty-input form-control text-center"
                                            data-product_id="{{ $product['item']->id }}"
                                            value="{{ $product['qty'] }}">