removed unnecessary argument validation
removed unnecessary argument validation

This avoids conflicts with changes like PR #176

shraddhabanerjee/entrust,Stichoza/entrust,vigneshpalanivel/entrust,Zizaco/entrust,pathirana/entrust,choeng/entrust,leon19910505/entrusts,bbatsche/entrust,yaoshanliang/entrust,leon19910505/entrusts,Jacq/entrust,moura137/entrust,Zizaco/entrust,taohaoge/entrust,acabin/entrust,peshkov3/entrust,philip8728/entrust,FireEngineRed/entrust,bramburn/entrust,yaoshanliang/entrust,jarbitlira/entrust,emunshi/entrust,dezon/entrust,buiphu/entrust,moura137/entrust,danielgelling/entrust,vigneshpalanivel/entrust,akshayagarwal/entrust,rhwilrForks/entrust,proshore/entrust-lumen,AndresRojasIsaza/entrust,proshore/entrust-lumen