Affects Version/s: Minecraft 16w42a
Fix Version/s: None
Pretty self explainig.
By playing around with the Loottables, I've noticed that there's
none for Vexes.
I'm guessing, that this is a bug, since even mobs like Endermites or Bats (which don't have any Loot in Vanilla) do have at least the JSON-file for their Loottable.