Puppet users - Jan 2014 - checking is package is installed ?

Hi,

How do we check if the package is installed, before installing it.

I with to uninstall a package which i can do with ensure => absent, but 
before doing this, i would like to check if the package really exists on 
the system or not?

Can someone help in here or redirect me to the correct documentation.

-Kaustubh

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