Comment 2 for bug 1746706

This does not be fixed perfectly by https://review.openstack.org/#/c/491346/ at situation like following case:

Originally navigation does not have specified menu. Since the non-admin user does not have menu for "Admin" dashboard, navigation will not be reproduced if "?nav=/admin/images/" specified at the end of URL like http://host.domain/ngdetails/OS::Glance::Image/ce46ef50-850a-46ed-8707-bd5b21e4f9b7?nav=%2Fadmin%2Fimages%2F

When we fix https://bugs.launchpad.net/horizon/+bug/1746709 , and it provides route for 404 page, it may good to route to 404 page if proper panel is not found.