aaa: disabling "go" search button when there are no namespaces

Bug-Url: https://bugzilla.redhat.com/1120720
Change-Id: I4eb1ed2648f3dccc39af9adf409d8c0ec73b2a6f
Topic: AAA
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>