fix check when can't send the command to the promoted slave
fix check when can't send the command to the promoted slave

pedigree/redis,4396/redis,xuguruogu/redis,xuguruogu/redis,xuguruogu/redis,pedigree/redis,4396/redis,pedigree/redis,4396/redis,4396/redis,pedigree/redis,xuguruogu/redis