Steps to reproduce the issue:
1. Create a Page Template by adding a title and a description.
2. Open the page template.
3. In the dockbar click Manage -> Page
A dialog is open but it's empty (except for breadcrumb)
This bug was introduced in ticket (fb332b2fa7d6274b31fd49c1074207ae3fc53f69
LPS-35170 - port My-Pages and Site-Pages actions to navbar layout)