Slightly more sensible error when no args required
Slightly more sensible error when no args required

Replaces errors such as:
`<command> requires at least 0 argument: "<command>"`
with:
`<command> should have no arguments: "<command>"`

flyinbutrs/thor,r7kamura/thor,segiddins/thor,doudou/thor,fhernandez173/thor,sideci-sample/sideci-sample-thor,groovenauts/thor,flyinbutrs/thor,r7kamura/thor,segiddins/thor,linkodehub/thor,b-dean/thor,linkodehub/thor,sideci-sample/sideci-sample-thor,fancyremarker/thor,b-dean/thor,erikhuda/thor,fancyremarker/thor,fhernandez173/thor,groovenauts/thor