From a bug report, if you used the apply command while
not carrying anything applicable except for unknown potion, you would get
"you don't have anything to apply" if that potion wasn't oil but an
inventory selection prompt (with '*' as the default since you wouldn't
have anything considered to be a likely candidate) if that potion was oil,
giving away information.
This fix makes carrying any unknown potion yield the inventory
selection result, unless oil is already discovered and hero can see that
the unknown potion isn't oil.
369b1031fd