fetch_prices iterator fix

amiibofindr/apps/amiibo/management/commands/fetch_price.py

@@ -25,14 +25,14 @@ class Command(BaseCommand):
                 check_price=True).values_list('item_id', flat=True)
             amazon = Crawler(region[1])
             products = amazon.fetch_batch(item_codes)
-            if isinstance(products, list):
+            try:
                 for product in products:
                     amiibo_shop = AmiiboShop.objects.get(
                         item_id=product['shop_product_id'],
                         shop__flag_code=region[0]
                     )
                     amiibo_shop.update_price(product['price'], product['currency'])
-            else:
+            except TypeError:
                 amiibo_shop = AmiiboShop.objects.get(
                     item_id=product['shop_product_id'],
                     shop__flag_code=region[0]