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

@rsolomakhin, for empty display item `label`, Chrome warns if it's empty but doesn't throw. Maybe we should do the same here? 

So, we can require at least one "valid" one. But console.warn if empty... I don't want to get into the game of checking, for instance:

```JS
.retry({error: " "}); //single space
.retry({error: "     "});
.retry({error: "\n"});
.retry({error: "\t"});
```

Alternatively, for all error label types, we trim and check if not empty string. Throw if empty. 

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/payment-request/issues/792#issuecomment-426690225