Upgraded Q -> 2 from #867 [1675460709593]

Judge has assessed an item in Issue 867 as 2 risk. The relevant finding follows: L-01, ProtocolDAO.sol lines 209 - 216: upgradeExistingContract mistakenly removes the address value of the new contract if the new contract’s name is the same as the old one. This can be easily fixed with unregisteri...