Fix test for product join None

Author: jakubwasikowski

tests/samples/schema.org/product.json

@@ -2,7 +2,7 @@
   "properties": {"brand": "ACME",
                  "name": "Executive Anvil",
                  "image": "anvil_executive.jpg",
-                 "description": "Sleeker than ACME's Classic Anvil, the\n      Executive Anvil is perfect for the business traveler\n      looking for something to drop from a height.",
+                 "description": "Sleeker than ACME's Classic Anvil, the Executive Anvil is perfect for the business traveler looking for something to drop from a height.",
                  "mpn": "925872",
                  "aggregateRating": {"type": "http://schema.org/AggregateRating",
                                      "properties": {"ratingValue": "4.4",