Fixed an error on audit due list when no audit_warning_days had been set [ch9764]
Fixed an error on audit due list when no audit_warning_days had been set [ch9764]

dmeltzer/snipe-it,mtucker6784/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,mtucker6784/snipe-it,ppavlov28/snipe-it,dmeltzer/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,snipe/snipe-it,uberbrady/snipe-it,uberbrady/snipe-it,snipe/snipe-it,ppavlov28/snipe-it,snipe/snipe-it,ppavlov28/snipe-it,dmeltzer/snipe-it,dmeltzer/snipe-it,snipe/snipe-it