Puppet users - May 2014 - Ignore resource in provider if not defined?

Afternoon all, 

I'm trying to update my Glassfish module [1] to support some additional 
functionality, such as clustering. 

I've done most of the code changes, and they all seem to work fine from a 
usage POV. However several of my tests [2] are failing with the following 
error:
  1) Puppet::Type::Application::ProviderAsadmin when asking exists? should 
return true if resource is present
     Failure/Error: application.provider.should be_exists
     Puppet::Error:
       Invalid parameter dashost(:dashost)
     # ./lib/puppet/provider/asadmin.rb:6:in `asadmin_exec'
     # ./lib/puppet/provider/application/asadmin.rb:22:in `exists?'
     # ./spec/unit/puppet/provider/application/asadmin_spec.rb:34:in `block 
(3 levels) in <top (required)>'

I suspect this is related to some changes I made to 
Puppet::Provider::Asadmin [3] in order to support running asadmin commands 
against a host other than localhost. 
Effectively, I'm just trying to only use the 'dashost' resource
value if
it's defined and not null. 
This works fine for actual usage, but seems to fail horribly for RSpec 
testing :( 

Cheers in advance for any replies. 

Regards
Gavin 

[1] https://github.com/fatmcgav/puppet-glassfish/tree/develop
[2] https://travis-ci.org/fatmcgav/puppet-glassfish/jobs/24549377#L505-L511
[3] 
https://github.com/fatmcgav/puppet-glassfish/blob/develop/lib/puppet/provider/asadmin.rb#L6-L8

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