Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1177570
Description of problem:

Customer is attempting to create a new host using the hammer command:

hammer -d host create --architecture-id 1 --domain-id 1 --environment-id 3 --hostgroup-id 3 --medium-id 7 --mac 52:54:00:12:34:45 --name example-vm  --operatingsystem-id 1 --owner-id 3 --partition-table-id 7 --provision-method build --puppet-ca-proxy-id 1 --puppet-proxy-id 1 --ask-root-password true --subnet-id 1 --compute-resource-id 1  --compute-profile "2-Medium" --compute-attributes start=true --model-id 1

This fails with the error "mac value is blank" despite the MAC of the intended host being supplied. The following debug log is generated from the command:

[ INFO 2014-12-23 11:49:52 Init] Initialization of Hammer CLI (0.1.1) has started...
[DEBUG 2014-12-23 11:49:52 Init] Running at ruby 1.8.7-p374
[ INFO 2014-12-23 11:49:52 Init] Configuration from the file /etc/hammer/cli_config.yml has been loaded
[ INFO 2014-12-23 11:49:52 Init] Configuration from the file /etc/hammer/cli.modules.d/foreman.yml has been loaded
[ INFO 2014-12-23 11:49:52 Init] Configuration from the file /etc/hammer/cli.modules.d/import.yml has been loaded
[ INFO 2014-12-23 11:49:52 Init] Configuration from the file /etc/hammer/cli.modules.d/katello.yml has been loaded
[DEBUG 2014-12-23 11:49:52 Connection] Registered: foreman
[DEBUG 2014-12-23 11:49:52 API] Global headers: {
              :accept => "application/json;version=2",
        :content_type => "application/json",
    "Accept-Language" => "en" 
}
[ INFO 2014-12-23 11:49:53 Modules] Extension module hammer_cli_foreman (0.1.1) loaded
[ INFO 2014-12-23 11:49:53 Modules] Extension module hammer_cli_import (0.10.4) loaded
[ INFO 2014-12-23 11:49:53 HammerCLI::MainCommand] subcommand organization (HammerCLIForeman::Organization) was removed.
[ INFO 2014-12-23 11:49:53 HammerCLI::MainCommand] subcommand organization (HammerCLIKatello::Organization) was created.
[ INFO 2014-12-23 11:49:53 Modules] Extension module hammer_cli_katello (0.0.4) loaded
[DEBUG 2014-12-23 11:49:53 Init] Using locale 'en'
[DEBUG 2014-12-23 11:49:53 Init] 'mo' files for locale domain 'hammer-cli' loaded from '/usr/lib/ruby/gems/1.8/gems/hammer_cli-0.1.1/locale'
[DEBUG 2014-12-23 11:49:53 Init] 'mo' files for locale domain 'hammer-cli-foreman' loaded from '/usr/lib/ruby/gems/1.8/gems/hammer_cli_foreman-0.1.1/locale'
[DEBUG 2014-12-23 11:49:53 Init] 'mo' files for locale domain 'hammer-cli-katello' loaded from '/usr/lib/ruby/gems/1.8/gems/hammer_cli_katello-0.0.4/locale'
[ INFO 2014-12-23 11:49:53 HammerCLI::MainCommand] Called with options: {"option_debug"=>true}
[ INFO 2014-12-23 11:49:53 HammerCLIForeman::Host] Called with options: {}
[ INFO 2014-12-23 11:49:53 HammerCLIForeman::Host::CreateCommand] Called with options: {"option_puppet_ca_proxy_id"=>"1", "option_managed"=>true, "option_operatingsystem_id"=>"1", "option_domain_id"=>"1", "option_hostgroup_id"=>"3", "option_model_id"=>"1", "option_puppet_proxy_id"=>"1", "option_subnet_id"=>"1", "option_owner_id"=>"3", "option_name"=>"example_vm", "option_build"=>true, "option_environment_id"=>"3", "option_mac"=>"52:54:00:12:34:45", "option_compute_profile_name"=>"2-Medium", "option_compute_resource_id"=>"1", "option_partition_table_id"=>"7", "option_ask_root_password"=>"***", "option_architecture_id"=>"1", "option_medium_id"=>"7", "option_interface_list"=>[], "option_compute_attributes"=>{"start"=>"true"}, "option_enabled"=>true, "option_provision_method"=>"build", "option_volume_list"=>[]}
[ INFO 2014-12-23 11:49:53 API] GET /api/compute_profiles
[DEBUG 2014-12-23 11:49:53 API] Params: {
    :search => "name = \"2-Medium\"" 
}
[DEBUG 2014-12-23 11:49:53 API] Headers: {
    :params => {
        :search => "name = \"2-Medium\"" 
    }
}
[DEBUG 2014-12-23 11:49:54 API] Response {
        "sort" => {
           "by" => nil,
        "order" => nil
    },
       "total" => 3,
        "page" => 1,
      "search" => "name = \"2-Medium\"",
     "results" => [
        [0] {
            "updated_at" => "2014-12-15T19:20:25Z",
            "created_at" => "2014-12-15T19:20:25Z",
                  "name" => "2-Medium",
                    "id" => 2
        }
    ],
    "per_page" => 50,
    "subtotal" => 1
}
Enter the root password for the host: 
[ INFO 2014-12-23 11:50:00 API] POST /api/hosts
[DEBUG 2014-12-23 11:50:00 API] Params: {
    "host" => {
                         "ptable_id" => "7",
                "compute_profile_id" => 2,
                         "root_pass" => "*REDACTED*",
                          "owner_id" => "3",
                         "medium_id" => "7",
                           "managed" => true,
                  "provision_method" => "build",
                "puppet_ca_proxy_id" => "1",
                      "hostgroup_id" => "3",
                          "model_id" => "1",
                "operatingsystem_id" => "1",
                   "puppet_proxy_id" => "1",
                             "build" => true,
                               "mac" => "52:54:00:12:34:45",
                    "environment_id" => "3",
                         "domain_id" => "1",
                   "architecture_id" => "1",
        "host_parameters_attributes" => {},
                           "enabled" => true,
                         "subnet_id" => "1",
                              "name" => "example_vm",
                "compute_attributes" => {
            "interfaces_attributes" => {},
                            "start" => "true",
               "volumes_attributes" => {},
                  "nics_attributes" => {}
        },
               "compute_resource_id" => "1" 
    }
}
[DEBUG 2014-12-23 11:50:00 API] Headers: {}
[DEBUG 2014-12-23 11:50:02 API] 422 Unprocessable Entity
{
    "error" => {
               "errors" => {
            "base" => [
                [0] "mac value is blank!" 
            ]
        },
        "full_messages" => [
            [0] "mac value is blank!" 
        ],
                   "id" => nil
    }
}
[ERROR 2014-12-23 11:50:02 Exception] mac value is blank!
Could not create the host:
  mac value is blank!

Version-Release number of selected component (if applicable):

foreman-1.6.0.49-1.el6sat.noarch
foreman-compute-1.6.0.49-1.el6sat.noarch
foreman-gce-1.6.0.49-1.el6sat.noarch
foreman-libvirt-1.6.0.49-1.el6sat.noarch
foreman-ovirt-1.6.0.49-1.el6sat.noarch
foreman-postgresql-1.6.0.49-1.el6sat.noarch
foreman-proxy-1.6.0.30-1.el6sat.noarch
foreman-selinux-1.6.0.14-1.el6sat.noarch
foreman-vmware-1.6.0.49-1.el6sat.noarch
ruby193-rubygem-foreman_bootdisk-2.0.6-1.1.el6sat.noarch
ruby193-rubygem-foreman_discovery-1.3.0-2.el6sat.noarch
ruby193-rubygem-foreman_hooks-0.3.5-2.el6sat.noarch
ruby193-rubygem-foreman-redhat_access-0.0.4-1.el6sat.noarch
ruby193-rubygem-foreman-tasks-0.6.9-1.1.el6sat.noarch
rubygem-hammer_cli-0.1.1-12.el6sat.noarch
rubygem-hammer_cli_foreman-0.1.1-16.el6sat.noarch
rubygem-hammer_cli_foreman_tasks-0.0.3-3.el6sat.noarch
rubygem-hammer_cli_import-0.10.4-1.3.el6sat.noarch
rubygem-hammer_cli_katello-0.0.4-14.el6sat.noarch
satellite-master.engi.oanda.com-foreman-client-1.0-1.noarch
satellite-master.engi.oanda.com-foreman-proxy-1.0-1.noarch

How reproducible:

Every time

Steps to Reproduce:
1. run command

Actual results:

Failure with "mac value is blank"

Expected results:

Succesful virtual machine creation.

Additional info:

See bug http://projects.theforeman.org/issues/7265