add default values to fix case where there are no values for product option (like text input) (#255)

Co-authored-by: Luis Alvarez D <luis@vercel.com>

framework/bigcommerce/lib/normalize.ts

@@ -10,7 +10,7 @@ function normalizeProductOption(productOption: any) {
   const {
     node: {
       entityId,
-      values: { edges },
+      values: { edges = [] } = {},
       ...rest
     },
   } = productOption