Slots vanish from webdrink on item deletion

[nickdepinet]

If a slot in WebDrink gets into a state where the item_id it references in the database no longer exists, the slot will disappear from WebDrink with no indication as to what has happened.

Current workaround - edit the slot in the database to reference an existing item_id.

[zthart]

This was not on the list of issues I expected to be assigned today