mcl_mapgen_core: Make mcl_sponges an optional dependency.

mods/MAPGEN/mcl_mapgen_core/init.lua

@@ -1000,25 +1000,27 @@ local function register_mgv6_decorations()
 
 	-- Wet Sponge
 	-- TODO: Remove this when we got ocean monuments
-	minetest.register_decoration({
-		deco_type = "simple",
-		decoration = "mcl_sponges:sponge_wet",
-		spawn_by = {"group:water"},
-		num_spawn_by = 1,
-		place_on = {"mcl_core:dirt","mcl_core:sand"},
-		sidelen = 16,
-		noise_params = {
-			offset = 0.00295,
-			scale = 0.006,
-			spread = {x = 250, y = 250, z = 250},
-			seed = 999,
-			octaves = 3,
-			persist = 0.666
-		},
-		flags = "force_placement",
-		y_min = mcl_vars.mg_lava_overworld_max + 5,
-		y_max = -20,
-	})
+	if minetest.get_modpath("mcl_cocoas") then
+		minetest.register_decoration({
+			deco_type = "simple",
+			decoration = "mcl_sponges:sponge_wet",
+			spawn_by = {"group:water"},
+			num_spawn_by = 1,
+			place_on = {"mcl_core:dirt","mcl_core:sand"},
+			sidelen = 16,
+			noise_params = {
+				offset = 0.00295,
+				scale = 0.006,
+				spread = {x = 250, y = 250, z = 250},
+				seed = 999,
+				octaves = 3,
+				persist = 0.666
+			},
+			flags = "force_placement",
+			y_min = mcl_vars.mg_lava_overworld_max + 5,
+			y_max = -20,
+		})
+	end
 
 	-- Add a small amount of tall grass everywhere to avoid areas completely empty devoid of tall grass
 	minetest.register_decoration({

mods/MAPGEN/mcl_mapgen_core/mod.conf

@@ -1,5 +1,5 @@
 name = mcl_mapgen_core
 author = Wuzzy
 description = The core of the MCL2 mapgen
-depends = mcl_init, mcl_core, biomeinfo, mcl_worlds, mcl_sponges, mcl_ocean, mcl_stairs, mcl_monster_eggs, mcl_structures
-optional_depends = mclx_core, mcl_cocoas
+depends = mcl_init, mcl_core, biomeinfo, mcl_worlds, mcl_ocean, mcl_stairs, mcl_monster_eggs, mcl_structures
+optional_depends = mclx_core, mcl_cocoas, mcl_sponges