CORE: Fix a testnet only divsion by zero bug
CORE: Fix a testnet only divsion by zero bug

On testnet with very small amount of holding accounts this would trigger

nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official