Fixed fatal error on cart page if not all translations are available (#…

…18)

src/Hyyan/WPI/Cart.php

@@ -137,7 +137,7 @@ public function translate_cart_item_permalink( $item_permalink, $cart_item ) {
         If ( $cart_variation_id !== 0 ) {
             // Variation
             $variation_translation = $this->get_variation_translation( $cart_variation_id );
-            return $variation_translation->get_permalink();
+            return $variation_translation ? $variation_translation->get_permalink() : $item_permalink;
         }
 
         return $item_permalink;