mcl_mapgen_core: Make mcl_flowers an optional dependency.

mcl_flowers was previously an undeclared dependency of mcl_mapgen_core.
Now it is both optional and declared.

mods/MAPGEN/mcl_mapgen_core/init.lua

@@ -1039,6 +1039,7 @@ local function register_mgv6_decorations()
 	end
 
 	-- Add a small amount of tall grass everywhere to avoid areas completely empty devoid of tall grass
+	if minetest.get_modpath("mcl_flowers") then
 		minetest.register_decoration({
 			deco_type = "simple",
 			place_on = {"group:grass_block_no_snow"},
@@ -1048,6 +1049,7 @@ local function register_mgv6_decorations()
 			y_max = mcl_vars.overworld_max,
 			decoration = "mcl_flowers:tallgrass",
 		})
+	end
 
 	local mushrooms = {"mcl_mushrooms:mushroom_red", "mcl_mushrooms:mushroom_brown"}
 	local mseeds = { 7133, 8244 }
@@ -1091,6 +1093,7 @@ local function register_mgv6_decorations()
 		decoration = "mcl_core:deadbush",
 	})
 
+	if minetest.get_modpath("mcl_flowers") then
 		local function register_mgv6_flower(name, seed, offset, y_max)
 			if offset == nil then
 				offset = 0
@@ -1131,6 +1134,7 @@ local function register_mgv6_decorations()
 		register_mgv6_flower("blue_orchid", 64500, nil, mcl_worlds.layer_to_y(67))
 		register_mgv6_flower("oxeye_daisy", 3490)
 		register_mgv6_flower("poppy", 9439)
+	end
 
 	-- Put top snow on snowy grass blocks. The v6 mapgen does not generate the top snow on its own.
 	minetest.register_decoration({

mods/MAPGEN/mcl_mapgen_core/mod.conf

@@ -2,4 +2,4 @@ name = mcl_mapgen_core
 author = Wuzzy
 description = The core of the MCL2 mapgen
 depends = mcl_init, mcl_core, biomeinfo, mcl_worlds
-optional_depends = mclx_core, mcl_cocoas, mcl_sponges, mcl_ocean, mcl_stairs, mcl_monster_eggs, mcl_structures
+optional_depends = mclx_core, mcl_cocoas, mcl_sponges, mcl_ocean, mcl_stairs, mcl_monster_eggs, mcl_structures, mcl_flowers