add new stage to cocoa, tweak code

cocoa.lua

@@ -125,25 +125,30 @@ local crop_def = {
 -- stage 1
 minetest.register_node("farming:cocoa_1", table.copy(crop_def))
 
--- stage2
+-- stage 2
 crop_def.tiles = {"farming_cocoa_2.png"}
+minetest.register_node("farming:cocoa_2", table.copy(crop_def))
+
+-- stage3
+crop_def.tiles = {"farming_cocoa_3.png"}
 crop_def.drop = {
 	items = {
 		{items = {'farming:cocoa_beans 1'}, rarity = 1},
 	}
 }
-minetest.register_node("farming:cocoa_2", table.copy(crop_def))
+minetest.register_node("farming:cocoa_3", table.copy(crop_def))
 
--- stage 3 (final)
-crop_def.tiles = {"farming_cocoa_3.png"}
+-- stage 4 (final)
+crop_def.tiles = {"farming_cocoa_4.png"}
 crop_def.groups.growing = 0
 crop_def.drop = {
 	items = {
 		{items = {'farming:cocoa_beans 2'}, rarity = 1},
 		{items = {'farming:cocoa_beans 1'}, rarity = 2},
+		{items = {'farming:cocoa_beans 1'}, rarity = 4},
 	}
 }
-minetest.register_node("farming:cocoa_3", table.copy(crop_def))
+minetest.register_node("farming:cocoa_4", table.copy(crop_def))
 
 -- add random cocoa pods to jungle tree's
 minetest.register_on_generated(function(minp, maxp)
@@ -181,7 +186,7 @@ minetest.register_on_generated(function(minp, maxp)
 				--print ("Cocoa Pod added at " .. minetest.pos_to_string(pos))
 
 				minetest.swap_node(pos, {
-					name = "farming:cocoa_" .. tostring(math.random(1, 3))
+					name = "farming:cocoa_" .. tostring(math.random(1, 4))
 				})
 			end
 

init.lua

@@ -211,7 +211,7 @@ local function reg_plant_stages(plant_name, stage, force_last)
 end
 
 
-register_plant_node = function(node)
+local register_plant_node = function(node)
 
 	local plant_name, stage = plant_name_stage(node)
 
@@ -554,8 +554,8 @@ farming.register_plant = function(name, def)
 			waving = 1,
 			tiles = {mname .. "_" .. pname .. "_" .. i .. ".png"},
 			paramtype = "light",
-			paramtype2 = def.paramtype2 or nil,
-			place_param2 = def.place_param2 or nil,
+			paramtype2 = def.paramtype2,
+			place_param2 = def.place_param2,
 			walkable = false,
 			buildable_to = true,
 			drop = drop,