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

I'd like to be careful we don't go too deep here, because a merchant could also screw up and do:

```JS
.retry({error: ""}); // just as bad as "{}"? 
```

Which is why I'd still argue that, `{}` === browser saying, "There was an issue processing the error, try again?"


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