Fix coin control change field behavior.
Fix coin control change field behavior.

Always check change address field value before creating new transaction.

novacoin-project/novacoin,novacoin-project/novacoin,penek/novacoin,gades/novacoin,byncoin-project/byncoin,stamhe/novacoin,novacoin-project/novacoin,elambert2014/novacoin,stamhe/novacoin,gades/novacoin,stamhe/novacoin,fsb4000/novacoin,elambert2014/novacoin,fsb4000/novacoin,gades/novacoin,penek/novacoin,fsb4000/novacoin,byncoin-project/byncoin,gades/novacoin,gades/novacoin,byncoin-project/byncoin,gades/novacoin,stamhe/novacoin,elambert2014/novacoin,fsb4000/novacoin,penek/novacoin,penek/novacoin,byncoin-project/byncoin,fsb4000/novacoin,novacoin-project/novacoin,byncoin-project/byncoin,stamhe/novacoin,novacoin-project/novacoin,penek/novacoin,elambert2014/novacoin,elambert2014/novacoin,elambert2014/novacoin,penek/novacoin,byncoin-project/byncoin,novacoin-project/novacoin,fsb4000/novacoin