Use a solidity version of at least 0.8.10 to have external calls skip contract existence checks if the external call has a return value
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/FixedPricePassThruGate.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/interfaces/IVoterID.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/MerkleDropFactory.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/MerkleEligibility.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/MerkleIdentity.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/MerkleLib.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/MerkleResistor.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/MerkleVesting.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/PermissionlessBasicPoolFactory.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/SpeedBumpPriceGate.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/contracts/VoterID.sol#L3
https://github.com/code-423n4/2022-05-factorydao/blob/e22a562c01c533b8765229387894cc0cb9bed116/interfaces/IVoterID.sol#L3
