if the amount is zero so the unhecked block will divided zero on 3 and we use gas for nothing ! if we set zero we may pass the _burn checks, i know it is passed by only permit but it's better to avoid this happen because it's seting by human and it means it can be set with 0 balance to burn !
https://github.com/Cyfrin/2023-10-SteadeFi/blob/main/contracts/strategy/gmx/GMXVault.sol#L688
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