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on RHEL systems, `pkg.retrieve[pkg.property(:ensure)]` returns `:absent`
when a package is not installed; this can generate an unsightly error
when running these facts on a RHEL system where the necessary OS
packages are not installed:
[root@gepeto ~]# facter -p osfamily
RedHat
[root@gepeto ~]# facter -p lsbmajdistrelease
5
[root@gepeto ~]# grep version /etc/puppet/modules/python/Modulefile
version '1.6.3'
[root@gepeto ~]# facter -p virtualenv_version pip_version
Could not retrieve virtualenv_version: can't convert Symbol into String
Could not retrieve pip_version: undefined method `[]' for nil:NilClass
Could not retrieve pip_version: can't convert Symbol into String
pip_version =>
virtualenv_version =>
Fixes #50
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