Bug: Quests on the hotkey bar can throw errors and fail to open.

[kavaliro]

Quests do not open in the hotkey bar, and throw an error--ONLY IF the quest is not closed and reopened before dragging to the hotkey bar.

To reproduce:

1. Create a quest item.
2. Drag it onto the hotkey bar BEFORE closing..
3. Click it or press the appropriate hotkey.

Result: It does not open, and throws the error:

Runtime Notice: Host session started
Runtime Error: desktop: Unable to create window with invalid class (ref_quest : quest.id-00001)