Added another check for no arguments.
Added another check for no arguments.

kbrock/chruby,JeanMertz/chruby-fish,ilikepi/chruby,ngpestelos/chruby,regularfry/chruby,rstacruz/chruby-fish,eunomie/chgo,postmodern/chruby,regularfry/chruby,postmodern/chruby,rstacruz/chruby-fish,ngpestelos/chruby,ilikepi/chruby,JeanMertz/chruby-fish,eunomie/chgo,kbrock/chruby