RAACToken contract has the functionailty of removing feeCollector when they do not want to charge tax on swap of tokens.
If protocol decides to change feeCollector to zero address, they won't be able to do it through the RAACMinter::setFeeCollector because of the zero address check condition.
Protocol won't be able to change RAACToken::feeCollector to zero address through RAACMinter::setFeeCollector because of zero address check.
Manual Review
Remove the check for zero address from RAACMinter:setFeeCollector
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