Superfluous require guard on WithdrawOwnerEth()

[maurelian]

What is it?

CrowdSaleLib makes a check on the token balance, to determine eligibility to withdraw Ether.

https://github.com/Modular-Network/ethereum-libraries/blob/audits/CrowdsaleLib/IICOLib/truffle/contracts/CrowdsaleLib.sol#L204

Problem

I can't see a reason that contract's token balance would need to be checked in order to allow a withdrawal, and I can think of some problem's it might cause.