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

Right now, `.retry()` can accept an empty dictionary, in which case the expectation is that the browser displays a custom error message telling the user to try the payment again. 

Should we be more strict about that by requiring that the dictionary have at least one valid error-related member? 

@romandev, @rsolomakhin, what does Chrome do with `.retry({/* no dictionary members*/})`?

@aestes, same question about Safari? 


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