do not charge for zerosize memory expands
do not charge for zerosize memory expands

pipermerriam/pyethereum,pipermerriam/pyethereum,karlfloersch/pyethereum,holiman/pyethereum,jnnk/pyethereum,harlantwood/pyethereum,karlfloersch/pyethereum,vaporry/pyethereum,ethereum/pyethereum,inzem77/pyethereum,ethermarket/pyethereum,shahankhatch/pyethereum,ddworken/pyethereum,ckeenan/pyethereum,shahankhatch/pyethereum,ethereum/pyethereum