Chrome Version       : 64.0.3253.3
OS Version: 
URLs (if applicable) : https://rsolomakhin.github.io/pr/bob/
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari 5:
  Firefox 4.x:
     IE 7/8/9:

What steps will reproduce the problem?
1. Install the payment handler from https://bobpay.xyz.
2. Open the payment sheet on https://rsolomakhin.github.io/pr/bob/.
3. Expand the list of all payment methods.

What is the expected result?
There should not be an "Add Card" button, because this payment request does not include "basic-card" as a supported payment method.

What happens instead of that?
The "Add Card" button is present and can be clicked. Upon clicking it, the "add card" sheet appears, but it has no card issuer network icons (because none of the networks are accepted).

Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3253.3 Safari/537.36