def account_is_empty(address)
      get_balance(address) == 0 && get_code(address) == Constant::BYTE_EMPTY && get_nonce(address) == 0
    end
def account_is_empty(address)
      get_balance(address) == 0 && get_code(address) == Constant::BYTE_EMPTY && get_nonce(address) == 0
    end
Returns true when the account is either empty or non-exist.