packaging: setup: database: extend check empty

do not check for specific table but if there is any table in public
schema.

Related-To: https://bugzilla.redhat.com/show_bug.cgi?id=1058013
Change-Id: I1703886f06afedcc339dfdf8f6c2138fa1c9d8e1
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>