robbyrussell/oh-my-zsh — pull request #1616 by sxeraverx (2013-02-19 18:20:54+00:00)
Title: pipe git version check error to /dev/null (for when git doesn't exist)

If you share your home directory among multiple machines, not all of which have git installed, oh-my-zsh throws up error messages on starting the shell. This silences the one that occurs when git doesn't exist.