arya/bluepill — pull request #129 by blt04 (2012-02-02 19:33:34+00:00)
Title: Only check for Bundler Gemfile if ENV['BUNDLE_GEMFILE'] is set

Calling File.exists? with a nil value results in an error:

TypeError: can't convert nil into String

Check to see if the environment variable is set before looking for the Gemfile.