CS-V2Gov-018: Possible Stuck Tokens in BribeInitiative

[danielattilasimon]

The contract BribeInitiative implements the function depositBribe() that allows anyone to deposit BOLD and another ERC20 token as bribes. These tokens are transferred out only when there are eligible user to claim bribes. However, it is possible that an initiative might not receive any YES vote in an epoch although there is a bribe. In such scenarios, the deposited tokens for that epoch would be stuck and cannot be recovered.

Furthermore, _claimBribe() rounds down the bribe amounts, therefore there is some dust that accumulates over time and is not recovered.