I suspect this is to do with Katello's defacing of the environment field, as the error shows fine on a plain Foreman installation.

Created redmine issue http://projects.theforeman.org/issues/6919 from this bug

Proposed fix in Katello PR: 
https://github.com/Katello/katello/pull/4527

Created attachment 928780 [details]
puppet environment can't be blank

Tested with Sat6-GA-Snap5

=======================================================
Processing by HostsController#create as */*
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"wKHsVOX1Qz4WtMyErXRiCKsgKw55bzkxrY01qXm956k=", "host"=>{"name"=>"dlink008", "organization_id"=>"1", "location_id"=>"2", "hostgroup_id"=>"", "compute_resource_id"=>"1", "environment_id"=>"", "content_source_id"=>"1", "puppet_ca_proxy_id"=>"1", "puppet_proxy_id"=>"1", "managed"=>"true", "progress_report_id"=>"[FILTERED]", "type"=>"Host::Managed", "compute_attributes"=>{"cpus"=>"1", "memory"=>"1073741824", "nics_attributes"=>{"new_nics"=>{"type"=>"bridge", "_delete"=>"", "bridge"=>"eth0", "model"=>"virtio"}, "0"=>{"type"=>"network", "_delete"=>"", "network"=>"foreman", "bridge"=>"eth0", "model"=>"virtio"}}, "volumes_attributes"=>{"new_volumes"=>{"pool_name"=>"default", "capacity"=>"10G", "allocation"=>"0G", "format_type"=>"raw", "_delete"=>""}, "0"=>{"pool_name"=>"default", "capacity"=>"10G", "allocation"=>"0G", "format_type"=>"raw", "_delete"=>""}}, "start"=>"1"}, "domain_id"=>"2", "realm_id"=>"1", "mac"=>"", "subnet_id"=>"1", "ip"=>"192.168.100.12", "interfaces_attributes"=>{"new_interfaces"=>{"_destroy"=>"false", "type"=>"Nic::Managed", "mac"=>"", "name"=>"", "domain_id"=>"", "ip"=>"", "provider"=>"IPMI"}}, "architecture_id"=>"1", "operatingsystem_id"=>"1", "provision_method"=>"build", "build"=>"1", "ptable_id"=>"7", "disk"=>"", "root_pass"=>"[FILTERED]", "is_owned_by"=>"3-Users", "enabled"=>"1", "model_id"=>"", "comment"=>"", "overwrite"=>"false"}, "kt_environment_id"=>"", "capabilities"=>"build image", "provider"=>"Libvirt"}
Processing by TasksController#show as */*
  Parameters: {"id"=>"3f4c16c3-053f-4ea9-a839-6e5b6c343518"}
  Rendered tasks/_list.html.erb (1.2ms)
Completed 200 OK in 29ms (Views: 11.5ms | ActiveRecord: 1.6ms)
Processing by TasksController#show as */*
  Parameters: {"id"=>"3f4c16c3-053f-4ea9-a839-6e5b6c343518"}
  Rendered tasks/_list.html.erb (0.2ms)
Completed 200 OK in 448ms (Views: 1.6ms | ActiveRecord: 2.6ms)
Processing by TasksController#show as */*
  Parameters: {"id"=>"3f4c16c3-053f-4ea9-a839-6e5b6c343518"}
  Rendered tasks/_list.html.erb (0.1ms)
Completed 200 OK in 12ms (Views: 1.3ms | ActiveRecord: 1.2ms)
Processing by TasksController#show as */*
  Parameters: {"id"=>"3f4c16c3-053f-4ea9-a839-6e5b6c343518"}
  Rendered tasks/_list.html.erb (0.1ms)
Completed 200 OK in 12ms (Views: 1.5ms | ActiveRecord: 1.2ms)
Failed to save: Environment can't be blank
^[[1;32mDeface:^[[0m 1 overrides found for 'hosts/_form'
^[[1;32mDeface:^[[0m 'hosts_update_environments_select' matched 1 times with 'code[erb-loud]:contains("select_f"):contains(":environment_id")'
  Rendered hosts/_progress.html.erb (1.4ms)
=================================================================


Installed Packages

    candlepin-0.9.23-1.el6_5.noarch
    candlepin-common-1.0.1-1.el6_5.noarch
    candlepin-scl-1-5.el6_4.noarch
    candlepin-scl-quartz-2.1.5-5.el6_4.noarch
    candlepin-scl-rhino-1.7R3-1.el6_4.noarch
    candlepin-scl-runtime-1-5.el6_4.noarch
    candlepin-selinux-0.9.23-1.el6_5.noarch
    candlepin-tomcat6-0.9.23-1.el6_5.noarch
    createrepo-0.9.9-21.2.pulp.el6sat.noarch
    elasticsearch-0.90.10-4.el6sat.noarch
    katello-1.5.0-28.el6sat.noarch
    katello-ca-1.0-1.noarch
    katello-certs-tools-1.5.6-1.el6sat.noarch
    katello-installer-0.0.59-1.el6sat.noarch
    m2crypto-0.21.1.pulp-10.el6sat.x86_64
    mod_wsgi-3.4-1.pulp.el6sat.x86_64
    pulp-katello-0.3-3.el6sat.noarch
    pulp-nodes-common-2.4.0-0.30.beta.el6sat.noarch
    pulp-nodes-parent-2.4.0-0.30.beta.el6sat.noarch
    pulp-puppet-plugins-2.4.0-0.30.beta.el6sat.noarch
    pulp-puppet-tools-2.4.0-0.30.beta.el6sat.noarch
    pulp-rpm-plugins-2.4.0-0.30.beta.el6sat.noarch
    pulp-selinux-2.4.0-0.30.beta.el6sat.noarch
    pulp-server-2.4.0-0.30.beta.el6sat.noarch
    python-gofer-qpid-1.3.0-1.el6sat.noarch
    python-isodate-0.5.0-1.pulp.el6sat.noarch
    python-kombu-3.0.15-12.pulp.el6sat.noarch
    python-pulp-bindings-2.4.0-0.30.beta.el6sat.noarch
    python-pulp-common-2.4.0-0.30.beta.el6sat.noarch
    python-pulp-puppet-common-2.4.0-0.30.beta.el6sat.noarch
    python-pulp-rpm-common-2.4.0-0.30.beta.el6sat.noarch
    python-qpid-0.22-14.el6sat.noarch
    python-qpid-qmf-0.22-37.el6.x86_64
    qpid-cpp-client-0.22-42.el6.x86_64
    qpid-cpp-server-0.22-42.el6.x86_64
    qpid-cpp-server-linearstore-0.22-42.el6.x86_64
    qpid-java-client-0.22-6.el6.noarch
    qpid-java-common-0.22-6.el6.noarch
    qpid-proton-c-0.7-1.el6.x86_64
    qpid-qmf-0.22-37.el6.x86_64
    qpid-tools-0.22-12.el6.noarch
    ruby193-rubygem-katello-1.5.0-82.el6sat.noarch
    rubygem-hammer_cli_katello-0.0.4-12.el6sat.noarch
    rubygem-smart_proxy_pulp-1.0.0-1.1.el6sat.noarch

This was delivered with Satellite 6.0 which was released on 10 September 2014.

This is still issue for me.

Hi Dhaval,

On Satellite 6.1.1 (which was recently GA'ed), I am seeing the proper error displayed when the puppet environment is omitted during a "New Host".  I am attaching the screenshot of my scenario.

If you are not seeing the error on your configuration, would you mind creating a new BZ with the details?  If possible, please attach the screenshot and foreman-debug output.

Thanks!

Created attachment 1064022 [details]
Puppet Environment : error shown on Satellite 6.1.1 UI