Change flash message for unpopulated database.
Change flash message for unpopulated database.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1106331
(transferred from ManageIQ/manageiq@7c095060ede18500c0efefd91c2f8e05a8549596)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic