As most agents and inspectors will attest, there are many creative homeowners out there.
Maybe the homeowner, or installer thought that there was a dishwasher when he/she snapped the plug out of the garbage disposal prior to installing. It was a good thing that this property had a nice selection of wines. They located just the right size cork to re-plug the hole.
Or maybe, the homeowner "borrowed" the disposal from his/her property that was foreclosed on but had no way of taking the dishwasher before the sheriff escorted them out.
I sure hope the inspector looks below the sink prior to checking the flow. This is an upstairs unit, which means BIG trouble for the lower unit if the utility restores water to the unit without turning valves off on the interior.