Description of problem:
It's not possible to transition a system that isn't subscribed to any child and base channel.
The reason is, we try to create an empty 'system content view', what fails.

Version-Release number of selected component (if applicable):
rubygem-hammer_cli_import-0.10.3-1.el6.noarch

How reproducible:
always

Steps to Reproduce:
1. import system profile with csv:
1000010037,vmware194.englab.brq.redhat.com,vmware194.englab.brq.redhat.com,"Initial Registration Parameters:
OS: redhat-release
Release: 5Server
CPU Arch: x86_64-redhat-linux",1,Red Hat IT,,,,,,,5Server,x86_64,,,Yes,VMware

Actual results:
* hammer import fails with:

Caught RestClient::UnprocessableEntity:422 Unprocessable Entity while processing CSV line:
{"hostname"=>"vmware194.englab.brq.redhat.com", "system_group_id"=>nil, "profile_name"=>"vmware194.englab.brq.redhat.com", "architecture"=>"x86_64", "release"=>"5Server", "server_id"=>"1000010037", "child_channel_id"=>nil, "virtual_host"=>nil, "organization_id"=>"1", "base_channel_id"=>nil, "description"=>"Initial Registration Parameters:\nOS: redhat-release\nRelease: 5Server\nCPU Arch: x86_64-redhat-linux", "virtual_guest"=>nil, "base_channel_label"=>nil}

* sat6 log contains:
Processing by Katello::Api::V2::ContentViewsController#create as application/json;version=2
  Parameters: {"label"=>"", "composite"=>true, "description"=>"Composite content view for content hosts", "component_ids"=>[], "name"=>"", "api_version"=>"
v2", "organization_id"=>"3", "content_view"=>{"name"=>"", "label"=>"", "description"=>"Composite content view for content hosts", "composite"=>true, "compo
nent_ids"=>[]}}
Authorized user admin(Admin User)
ActiveRecord::RecordInvalid
label: ["can't be blank", "cannot contain characters other than ascii alpha numerals, '_', '-'. ", "must contain at least 1 character"]
name: ["can't be blank", "must contain at least 1 character"]

Expected results:
successful transition