Fix error handling in fakeBlockChain
Fix error handling in fakeBlockChain

Signed-off-by: Sina Mahmoodi <5efde75dc89cf3dd6979127c39f2579ba2efcec2@gmail.com>

ethereumjs/ethereumjs-vm,ethereum/ethereumjs-vm,ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm