Re: [w3c/payment-request] consider requiring an error (non-empty dict) for .retry()? (#792)

> I think we should allow `retry({});`. If there is no valid error-related member, UA can display default value.

I tend to feel the same, but that's my personal position. 

@mnoorenberghe from our front end team feels there should be at least one valid (#793) member present. 

Would appreciate additional input from other implementers - @zkoch opinions? 

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