Update invocation.rb
Update invocation.rb

when calling invoke with a bad name, raise "Missing Thor class for invoke #{name}"

groovenauts/thor,sideci-sample/sideci-sample-thor,segiddins/thor,sideci-sample/sideci-sample-thor,groovenauts/thor,segiddins/thor,fhernandez173/thor,flyinbutrs/thor,fancyremarker/thor,linkodehub/thor,b-dean/thor,fhernandez173/thor,doudou/thor,flyinbutrs/thor,erikhuda/thor,fancyremarker/thor,linkodehub/thor,b-dean/thor