The `core\plugininfo\base::is_enabled()` uses three-state logic for its
return value. It can return null as a valid value as per its
documentation. We need to test for the explicit false value in this
case.
To make the attached Behat test able to identify the table, the caption
is added. It seems to be helpful for all users so I leave it displayed
without using the accesshide mechanism.
David Mudrák
cdcb53a114