Fix crash on exit when -createwalletbackups=0 (#1810)
Fix crash on exit when -createwalletbackups=0 (#1810)


UdjinM6/dash,biblepay/biblepay,dashpay/dash,thelazier/dash,dashpay/dash,crowning-/dash,nmarley/dash,ionomy/ion,BlockchainTechLLC/3dcoin,biblepay/biblepay,UdjinM6/dash,ionomy/ion,biblepay/biblepay,UdjinM6/dash,crowning-/dash,terracoin/terracoin,terracoin/terracoin,terracoin/terracoin,ivansib/sibcoin,ionomy/ion,UdjinM6/dash,nmarley/dash,biblepay/biblepay,ivansib/sibcoin,nmarley/dash,biblepay/biblepay,UdjinM6/dash,ionomy/ion,crowning-/dash,crowning-/dash,nmarley/dash,dashpay/dash,thelazier/dash,nmarley/dash,BlockchainTechLLC/3dcoin,ivansib/sibcoin,thelazier/dash,dashpay/dash,biblepay/biblepay,crowning-/dash,thelazier/dash,crowning-/dash,BlockchainTechLLC/3dcoin,biblepay/biblepay,ivansib/sibcoin,terracoin/terracoin,thelazier/dash,BlockchainTechLLC/3dcoin,nmarley/dash,dashpay/dash,ivansib/sibcoin,terracoin/terracoin,BlockchainTechLLC/3dcoin,nmarley/dash,terracoin/terracoin,ionomy/ion,biblepay/biblepay,ivansib/sibcoin,BlockchainTechLLC/3dcoin,ionomy/ion