Description of Bug: Firelamp completely vanished after trying to swap out its bulb!
Reproduction Steps:

1.  Have an uncharged firelamp and a fully charged firebulb in inventory.
2.  Attempt to drag and drop the firebulb into the lamp.
3.  Both items vanish. Log out and log back on again. The firebulb returns, but the firelamp does not.