webadmin: Block profile creation even if network's flushed

A previous fix neglected the fact that the Edit Network dialog could
be flushed but remain open, e.g. as in the case of a failed backend
action. This patch disables the profile creation logic in that case as
well.

Change-Id: Ia099ce1af15393cb498775afd0b435069fc0e0f1
Bug-Url: https://bugzilla.redhat.com/1043386
Signed-off-by: Lior Vernia <lvernia@redhat.com>