[3.4-RC] Dropping items in the dark

[PowerWyrm]

Found this while playtesting my variant, and reproduced it with the latest 3.4-RC:
- when you drop an item on the ground in the dark (you can do that by removing your light source and walking on a dark tile), it simply disappears
- if you walk on the item while having a similar item in the inventory and the pickup_inven option is on, you manage to combine the items
- if you walk on the item and it's not similar to something you have in the inventory, nothing happens at all: no message (when you're blind, but carry a light source, you get a "You feel..." message), and pressing "g" doesn't initiate pickup... it's just like the item has been squelched

I re-downloaded 3.3 and 3.2 to see if the same bug happens in these versions: the problem happens in 3.3, but not in 3.2 (you get a message and can get the item while in the dark). Clearly a regression...