Fix deprecation warning from number_format() method when get null v…

…alue from

PriceHelper.

src/templates/Shop/productList.latte

@@ -77,7 +77,7 @@
               <tr>
                 <td>
                   <div class="price">
-                    <span class="catalog-price" n:if="$product->catalog_price != $product->price">
+                    <span class="catalog-price" n:if="$product->catalog_price && $product->catalog_price != $product->price">
                       {$product->catalog_price|price}
                     </span>
                     {$product->price|price}