Puppet users - Mar 2013 - Processing custom function response from calling custom function?

Morning all

I''m trying to write a custom function that calls the foreman search 
function 
(https://github.com/ohadlevy/puppet-foreman/blob/master/foreman/lib/puppet/parser/functions/foreman.rb)
and then processes the results, before returning itself... 

A code snippet is here: http://pastebin.com/MPf7z0ui. This also includes 
the error being returned by Puppet agent on runtime. 

The notice in my function does print out in the master messages.log, with 
the following content: 
puppet-master[28971]: (Scope(Class[Act::Server::Linux::Db::Oracle])) 
DB_servers looks like: . Nil = false. Class = Hash. Ap = .

However I''m still getting the puppet error when running the agent???

Any ideas greatly received. 

Regards
Gavin 

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