Change error for functions that return undefined
Change error for functions that return undefined

adammcarth/rethinkdbdash,mbroadst/rethunk,kulbirsaini/rethinkdbdash,mbroadst/rethinkdbdash,abhishekgahlot/rethinkdbdash,tswayne/rethinkdbdash,dmitrig01/rethinkdbfake,marshall007/rethinkdbdash,neumino/rethinkdbdash,beni55/rethinkdbdash,JohnyDays/rethinkdbdash,andrerpena/rethinkdbdash