[w3c/browser-payment-api] ShippingAddress and null values (#495)

In the "Shipping address changed algorithm", the spec says: 

> Set the shippingAddress attribute on request to the shipping address provided by the user. 

However, it gives no guidance about null values incoming from the information source for the `ShippingAddress`. As such, a lot of those attributes could end up as empty strings. That's ok, but it's not clear in the spec what to do.  

It's also ambiguous in that "new PaymentAddress" is never actually called (even though it has no declared constructor). 


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