engine_page: set password when no address is used

We should allow users to set password even when no
registration is required.

Change-Id: I4d2f27901fd01a8ebd1926ac7328b5cf04ea88aa
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1096074
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>