cli

root@zabbix:~# /usr/local/bin/zabbix_host.py -t 10105 -g 8,2 --exists dev1.example.org
root@zabbix:~# /usr/local/bin/zabbix_host.py -t 10105 -g 8,2  dev1.example.org
root@zabbix:~# /usr/local/bin/zabbix_host.py -t 10105 -g 8,2 --exists dev1.example.org
[{u'hostid': u'10454'}]

debug

See it executes fine

Debug: Executing '/usr/local/bin/zabbix_host.py -t 10105 -g 8,2 --exists dev1.example.org'

and if there is no host it returns an empty string but i never see it run 

'/usr/local/bin/zabbix_host.py -t 10105 -g 8,2 dev1.example.org'

node.pp

{

  @@zabbix_host {
    $::fqdn:
      ensure      => present,
      groupids    => '8,2',
      templateids => '10105',
    }
    
  Zabbix_host <<| |>>
}

provider\test\node.rb

Puppet::Type.type(:zabbix_host).provide(:zabbix) do

    commands :zabbix_host => '/usr/local/bin/zabbix_host.py'
    defaultfor :kernel => 'Linux'


    def create
      zabbix_host('-t',@resource[:templateids], '-g', @resource[:groupids], @resource[:name])
    end

    def destroy
    end

    def exists?
      not zabbix_host('-t',@resource[:templateids], '-g', @resource[:groupids],
                        '--exists', @resource[:name]).empty?
    end

end