Description of problem:
Running Packstack (openstack-packstack) with the latest Puppet fails with "Could not evaluate: undefined method `[]=' for nil:NilClass". Downgrading Puppet fixes this issue.

Version-Release number of selected component (if applicable):
puppet-2.6.18-2.el6.noarch

How reproducible:
Always

Steps to Reproduce:
1. yum install --enablerepo=epel-testing -y puppet openstack-packstack
2. packstack --gen-answer-file=/tmp/ans.txt
3. packstack --answer-file=/tmp/ans.txt

(to making testing easier, editing the ans.txt to suit the test system better shouldn't change the result unless you disable most or all of the OpenStack components)
 
Actual results:
ERROR : Error during puppet run : err: /Stage[main]/Keystone/Service[keystone]: Could not evaluate: undefined method `[]=' for nil:NilClass

(According to other reports the issue can also show up in other manifests, either due to different Packstack versions or different configuration (ans.txt)).


Expected results:
 **** Installation completed successfully ******

Additional info: