Fixed: '/havenbags autopickup' without the last parameter, should no longer cause errors.

Fixed: Changing the autopickup of a bag with an invalid owner (Unused or Unbound), no longer causes errors.
The message "This bag does not exist." will still be shown for now.

Fixed: '/havenbags info' no longer causes errors if the bag has no valid owner (Unused or Unbound).
The bag's weight was attempted to be fetched, but the bag had no valid contents to weigh.