fix: uncought exception on discconect
fix: uncought exception on discconect

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