Updated html helper, do not add attributes that have NULL values
Updated html helper, do not add attributes that have NULL values

exlant/kohana,madeofpeople/latticeFolio,zhangjingpu/kohana,driutheman/kohana,gartz/KohanaCV,Konro1/pms,mattwadey/kohana,gold3bear/kohana,OpenBuildings/jam-resource,web-player/kohana,exlant/kohana,driutheman/kohana,anhnt0212/kohana,manyahin/moviestest,kohana/kohana,enov/Aurora-QA,acoulton/slowtask-demo,jellycheng/kohana,16nsk/kohana,JanvanCasteren/kohana,qianzy96/kohana,madeofpeople/latticeFolio,dreamsxin/kohana,yeysman/kohana,ajose1024/kohana,kebot/GiBeans,madeofpeople/latticeFolio,ryross/konfig_test