Fix handling of scope calls with single argument
Fix handling of scope calls with single argument

jeffyip/brakeman,jakeatwork/brakeman,kbrock/brakeman,dfens/brakeman,bf4/brakeman,spcoder/brakeman,dfens/brakeman,bf4/brakeman,lee-leon/brakeman,masarakki/brakeman,spcoder/brakeman,htdc/brakeman,codeclimate/brakeman-deprecated,htdc/brakeman,bf4/brakeman,cheerfulstoic/brakeman,masarakki/brakeman,github/brakeman,oreoshake/brakeman,jlecour/brakeman,jlecour/brakeman,jakeatwork/brakeman,lee-leon/brakeman,oreoshake/brakeman,github/brakeman,cheerfulstoic/brakeman,cheerfulstoic/brakeman,masarakki/brakeman,dfens/brakeman,codeclimate/brakeman-deprecated,jlecour/brakeman,lee-leon/brakeman,spcoder/brakeman,kbrock/brakeman,jeffyip/brakeman,liqites/brakeman,htdc/brakeman,jakeatwork/brakeman,kbrock/brakeman,liqites/brakeman,liqites/brakeman