Don't try to fetch ACLs for unsaved/new scopes

[derrabauke]

Description

In the scope.edit view when creating a new scope, the ACL table tries to fetch the ACLs for the current scope. As the scope model isNew, it can not have any ACLs and the request for the table returns a 400, cause it's missing the scope id query param. As we know this request will fail up front, we should not make it in the first place.

Expected behavior

The table should not try to fetch the ACLs when the currently selected scope isNew === true.