Add some logging to help monitor absent witnesses at tip of chain.
Add some logging to help monitor absent witnesses at tip of chain.

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