Description of problem:
if we try to deselect "Compute profile" on the "New Host" page, we lose "Virtual Machine" tab and the selectbox "Compute profile" itself.
 

Version-Release number of selected component (if applicable):
ruby193-rubygem-foreman_bootdisk-2.0.6-1.1.el6sat.noarch
foreman-gce-1.6.0.18-1.el6sat.noarch
foreman-libvirt-1.6.0.18-1.el6sat.noarch
katello-certs-tools-1.5.5-1.el6sat.noarch
foreman-postgresql-1.6.0.18-1.el6sat.noarch
rubygem-hammer_cli_foreman_tasks-0.0.3-2.el6sat.noarch
foreman-ovirt-1.6.0.18-1.el6sat.noarch
ruby193-rubygem-foreman_discovery-1.3.0-0.1.rc2.el6sat.noarch
katello-1.5.0-26.el6sat.noarch
foreman-selinux-1.6.0-4.el6sat.noarch
katello-ca-consumer-sat6-rhel6.usersys.redhat.com-1.0-1.noarch
rubygem-hammer_cli_foreman-0.1.1-9.el6sat.noarch
foreman-1.6.0.18-1.el6sat.noarch
foreman-vmware-1.6.0.18-1.el6sat.noarch
ruby193-rubygem-foreman_hooks-0.3.5-2.el6sat.noarch
pulp-katello-0.3-3.el6sat.noarch
foreman-proxy-1.6.0.8-1.el6sat.noarch
katello-ca-1.0-1.noarch
sat6-rhel6.usersys.redhat.com-foreman-proxy-1.0-1.noarch
foreman-compute-1.6.0.18-1.el6sat.noarch
ruby193-rubygem-foreman-tasks-0.6.2-2.el6sat.noarch
sat6-rhel6.usersys.redhat.com-foreman-client-1.0-1.noarch
ruby193-rubygem-foreman-redhat_access-0.0.4-1.el6sat.noarch
rubygem-hammer_cli_katello-0.0.4-7.el6sat.noarch
ruby193-rubygem-katello-1.5.0-59.el6sat.noarch
katello-installer-0.0.49-1.el6sat.noarch

How reproducible:
100%

Steps to Reproduce:
1. We have got Sat6 with some "Compute resource" (in my case RHEV) and some "Compute profile".
2. open "Host" > "New Host"
3. select these options
Deploy on: RHEV
Compute profile: "1-Small"
4. deselect this option
Compute profile: <empty line>

Actual results:
We lose "Virtual Machine" tab and the selectbox "Compute profile".

Expected results:
The tab "Virtual Machine" and the selectbox "Compute profile" will be still visible.

Additional info: