Further fix for issue of headers entering into setBlockIndexCandidates.
Further fix for issue of headers entering into setBlockIndexCandidates.

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