fixed getblockhash input checking
fixed getblockhash input checking

xCoreDev/vanillacoin,fczuardi/vanillacoin,fczuardi/vanillacoin,xCoreDev/vcash,openvcash/vcash,xCoreDev/vanillacoin,sum01/vcash,xCoreDev/vcash,sum01/vcash,openvcash/vcash