ripienaar/puppet-catalog-diff — pull request #8 by mrwacky42 (2013-03-05 20:44:48+00:00)
Title: Allow resource[:parameters][:content] == false

In the unlikely event that a user has a puppet define with a parameter
named 'content' and this is false, puppet catalog diff will crash and
burn in a fiery blaze reminiscent of the Hindenburg disaster.

Less dramatically, this unhelpful error is what you get:

err: can't convert false into String
err: Try 'puppet help catalog diff' for usage