puppetlabs/facter — pull request #567 by Iristyle (2013-12-03 19:32:46+00:00)
Title: Ticket/stable/22622 external facts without output cause failures

- Previously, if an external fact generated empty output, parse would
be called with a nil, which cannot have each_line called on it, and
would cause Facter to crash. This sets a reasonable default for
external command output to the empty string