No longer drop pearls, they're useless atm

mods/default/nodes.lua

@@ -1116,14 +1116,16 @@ minetest.register_node(
       },
       sunlight_propagates = true,
       walkable = false,
-      drop = {
+      -- TODO: Enable the drop code below, when the pearl is useful.
+      -- The pearl is currently useless.
+      --[[drop = {
 	 max_items = 3,
 	 items = {
 	    {items = {"default:clam"}, rarity = 1},
 	    {items = {"default:pearl"}, rarity = 60},
 	    {items = {"default:pearl"}, rarity = 20},
 	 }
-      },
+      },]]
       groups = {fleshy = 3, oddly_breakable_by_hand = 2, choppy = 3, attached_node = 1, food = 2},
       on_use = minetest.item_eat({hp = 4, sat = 40}),
       sounds = default.node_sound_defaults(),