junk code clean up
junk code clean up
junk code cleanup
bug fix (ListManager class)

# fixed an "out of range" type bug when there is no list and ListManager
tries to return one.
bug-fix (ChopperEngine class)

related to the last commit (b00ade4). A pop up message box now displays
when there is no check list, or more than 1 check list, or no reference
list.
.user update