[Key Contacts Management] Add payment methods empty table state
See conversation here for more details: #6786 (comment 1512818129)
Implementation
We're currently showing a banner when no payment methods are present.
Adjust so that we still show the table headers with You have no saved payment methods
as table content.
We may be able to use a Pajamas implementation GlTable and get the empty state logic for free. We'd need to grab the implementation from GitLab since it's for the ViewComponent (HAML)
Edited by Laura Callahan