Gas Optimizations

[code423n4]

Zero check is missing in various functions:
To avoid opening multiple gas reports, I have consolidated them all in one.

Description:
The below functions lack zero checks for the address parameters. If a valid address is not checked, the ownership can be easily transferred or hacked.
AuraToken.constructor(address,string,string)._proxy (Aura.sol#46) lacks a zero-check on :
- vecrvProxy = _proxy (Aura.sol#51)
AuraBalRewardPool.constructor(address,address,address,address,address,uint256)._rewardManager (AuraBalRewardPool.sol#65) lacks a zero-check on :
- rewardManager = _rewardManager (AuraBalRewardPool.sol#72)
AuraBalRewardPool.constructor(address,address,address,address,address,uint256)._penaltyForwarder (AuraBalRewardPool.sol#67) lacks a zero-check on :
- penaltyForwarder = _penaltyForwarder (AuraBalRewardPool.sol#74)
AuraClaimZap.constructor(address,address,address,address,address,address)._crv (AuraClaimZap.sol#69) lacks a zero-check on :
- crv = _crv (AuraClaimZap.sol#76)
AuraClaimZap.constructor(address,address,address,address,address,address)._cvx (AuraClaimZap.sol#70) lacks a zero-check on :
- cvx = _cvx (AuraClaimZap.sol#77)
AuraClaimZap.constructor(address,address,address,address,address,address)._cvxCrv (AuraClaimZap.sol#71) lacks a zero-check on :
- cvxCrv = _cvxCrv (AuraClaimZap.sol#78)
AuraClaimZap.constructor(address,address,address,address,address,address)._crvDepositWrapper (AuraClaimZap.sol#72) lacks a zero-check
on :
- crvDepositWrapper = _crvDepositWrapper (AuraClaimZap.sol#79)
AuraClaimZap.constructor(address,address,address,address,address,address)._cvxCrvRewards (AuraClaimZap.sol#73) lacks a zero-check on : - cvxCrvRewards = _cvxCrvRewards (AuraClaimZap.sol#80)
AuraClaimZap.constructor(address,address,address,address,address,address)._locker (AuraClaimZap.sol#74) lacks a zero-check on :
- locker = _locker (AuraClaimZap.sol#81)
AuraLocker.constructor(string,string,address,address,address)._cvxCrv (AuraLocker.sol#151) lacks a zero-check on :
- cvxCrv = _cvxCrv (AuraLocker.sol#159)
AuraLocker.constructor(string,string,address,address,address)._cvxCrvStaking (AuraLocker.sol#152) lacks a zero-check on :
- cvxcrvStaking = _cvxCrvStaking (AuraLocker.sol#160)
AuraMerkleDrop.constructor(address,bytes32,address,address,address,uint256,uint256)._dao (AuraMerkleDrop.sol#54) lacks a zero-check on :
- dao = _dao (AuraMerkleDrop.sol#62)
AuraMerkleDrop.constructor(address,bytes32,address,address,address,uint256,uint256)._penaltyForwarder (AuraMerkleDrop.sol#58) lacks a
zero-check on :
- penaltyForwarder = _penaltyForwarder (AuraMerkleDrop.sol#66)
AuraMerkleDrop.setDao(address)._newDao (AuraMerkleDrop.sol#77) lacks a zero-check on :
- dao = _newDao (AuraMerkleDrop.sol#79)
AuraStakingProxy.constructor(address,address,address,address,address,uint256)._rewards (AuraStakingProxy.sol#67) lacks a zero-check on :
- rewards = _rewards (AuraStakingProxy.sol#74)
AuraStakingProxy.constructor(address,address,address,address,address,uint256)._crv (AuraStakingProxy.sol#68) lacks a zero-check on :
- crv = _crv (AuraStakingProxy.sol#76)
AuraStakingProxy.constructor(address,address,address,address,address,uint256)._cvx (AuraStakingProxy.sol#69) lacks a zero-check on :
- cvx = _cvx (AuraStakingProxy.sol#77)
AuraStakingProxy.constructor(address,address,address,address,address,uint256)._cvxCrv (AuraStakingProxy.sol#70) lacks a zero-check on
:
- cvxCrv = _cvxCrv (AuraStakingProxy.sol#78)
AuraStakingProxy.constructor(address,address,address,address,address,uint256)._crvDepositorWrapper (AuraStakingProxy.sol#71) lacks a zero-check on :
- crvDepositorWrapper = _crvDepositorWrapper (AuraStakingProxy.sol#79)
AuraStakingProxy.setCrvDepositorWrapper(address,uint256)._crvDepositorWrapper (AuraStakingProxy.sol#88) lacks a zero-check on :
- crvDepositorWrapper = _crvDepositorWrapper (AuraStakingProxy.sol#92)
AuraStakingProxy.setKeeper(address)._keeper (AuraStakingProxy.sol#99) lacks a zero-check on :
- keeper = _keeper (AuraStakingProxy.sol#101)
AuraStakingProxy.setPendingOwner(address)._po (AuraStakingProxy.sol#107) lacks a zero-check on :
- pendingOwner = _po (AuraStakingProxy.sol#109)
AuraStakingProxy.setRewards(address).rewards (AuraStakingProxy.sol#137) lacks a zero-check on :
- rewards = rewards (AuraStakingProxy.sol#139)
AuraVestedEscrow.constructor(address,address,address,uint256,uint256).admin (AuraVestedEscrow.sol#51) lacks a zero-check on :
- admin = admin (AuraVestedEscrow.sol#60)
AuraVestedEscrow.setAdmin(address)._admin (AuraVestedEscrow.sol#77) lacks a zero-check on :
- admin = _admin (AuraVestedEscrow.sol#79)
BalLiquidityProvider.constructor(address,address,uint256,address,address)._dao (BalLiquidityProvider.sol#31) lacks a zero-check on :
- dao = _dao (BalLiquidityProvider.sol#38)
ClaimFeesHelper.constructor(address,address,address)._voterProxy (ClaimFeesHelper.sol#32) lacks a zero-check on :
- voterProxy = _voterProxy (ClaimFeesHelper.sol#36)
CrvDepositorWrapper.constructor(address,IVault,address,address,bytes32)._crvDeposit (CrvDepositorWrapper.sol#108) lacks a zero-check on :
- crvDeposit = _crvDeposit (CrvDepositorWrapper.sol#114)

Mitigation:
Always check for valid incomin address.