omnibus does not populate languages[:ruby] with omnibus ruby

While trying to troubleshoot an nil value for node['languages']['ruby']['gems_dir']
in the most recent chef-server recipe, I discovered that Ohai's ruby language plugin can't find the ruby executable and is thus failing to populate languages[:ruby]:

[root@testing-chefserver01 ~]# ohai | grep -C4 ruby 
{
  "languages": {
    "ruby": {

    },

If I add /opt/opscode/embedded/bin to $PATH and run Ohai manually, Ohai is able to find the ruby executable and populate languages[:ruby]:

[root@testing-chefserver01 ~]# echo $PATH
/opt/opscode/embedded/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
[root@testing-chefserver01 ~]# ohai | grep -C4 ruby 

{
  "languages": {
    "ruby": {
      "platform": "x86_64-linux",
      "version": "1.9.2",
      "release_date": "2011-02-18",
      "target": "x86_64-unknown-linux-gnu",

However this work-around doesn't work for regular, Upstart-initiated chef-client runs - languages[:ruby] remains empty when the chef-server cookbook runs. I'm unsure if this bug is the fault of the languages/ruby plugin for using the ruby executable to determine the info, or if it is the fault of the Chef omnibus installer for not putting /opt/opscode/embedded/bin in the path or creating a symlink to the ruby executable in a default $PATH location.