Add an edge-case to check if we couldn't detect the checksum utility.
Add an edge-case to check if we couldn't detect the checksum utility.

FreedomBen/ruby-install,regularfry/ruby-install,ngpestelos/ruby-install,bascht/ruby-install,FreedomBen/ruby-install,ngpestelos/ruby-install,postmodern/ruby-install,boone/ruby-install,firstval/ruby-install,boone/ruby-install,bascht/ruby-install,firstval/ruby-install,PLOS/ruby-install,PLOS/ruby-install,postmodern/ruby-install,regularfry/ruby-install