Fix more problems of Predis\MultiExecContext on certain cases.
Fix more problems of Predis\MultiExecContext on certain cases.

moria/predis,dominics/predis,quangnguyen90/predis,CloudSide/predis,zhangyancoder/predis,channelgrabber/predis,nrk/predis,SecureCloud-biz/predis,johnhelmuth/predis,RedisLabs/predis,gopalindians/predis,RudyJessop/predis,protomouse/predis,stokes3452/predis,gencer/predis,nguyenthaihan/predis,SwelenFrance/predis,WalterShe/predis,lvbaosong/predis,oswaldderiemaecker/predis,vend/predis,dzung2t/predis,mrkeng/predis