Puppet users - Jan 2014 - Collector, Overriding Params and undef vars

Hi,

I had a nice setup where I'd load a hash of from hiera as virtual 
resources. These would be considered defaults that could be overridden 
through a defined type. The defined type would allow things like homedir 
and such to be overridden and the rest of the params would use the defaults 
as already set when declaring the virtual resource.

Suddenly someone discovered that this no longer worked. I'm pretty sure it 
did in the past though.

define userman_mw::users::virtualuser (
  $tagged         = undef,
  $account        = undef,
  $email          = undef,
  $groups         = undef,
  $uid            = undef,
  $shell          = undef,
  $homedir        = undef,
  $homemode       = undef,
  $manage_homedir = undef,
  $service        = false,
) {
  Userman_mw::Add_user <| $attribute == $value |> {
    email          => $email,
    groups         => $groups,
    uid            => $uid,
    shell          => $shell,
    homedir        => $homedir,
    homemode       => $homemode,
    manage_homedir => $manage_homedir,
  }
}

This a snipped version of the define that allows overriding. In the past, 
when no overrides were provided, the collector seemed to interpret that as 
'do not change whatever the param was initially declared as'. Now,
despite
being 'undef', these variables cause the declared parameters values to
be
set to nil.

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