Fix crash: CoinControl "space" bug
Fix crash: CoinControl "space" bug

This is a port of the pull bitcoin/bitcoin#5700 made by fsb4000 for
Bitcoin Core to fix the crash problem: CoinControl "space" bug.

jyap808/jumbucks,jyap808/jumbucks,jyap808/jumbucks,jyap808/jumbucks,jyap808/jumbucks