Moved ferns "'module' loaded" asserts to top of files

ferns/fern.lua

@@ -13,6 +13,8 @@
 -- http://www.mygarden.net.au/gardening/athyrium-yokoscense/3900/1
 -----------------------------------------------------------------------------------------------
 
+assert(abstract_ferns.config.enable_lady_fern == true)
+
 abstract_ferns.grow_fern = function(pos)
 	local fern_size = math.random(1,4)
 	local right_here = {x=pos.x, y=pos.y+1, z=pos.z}
@@ -102,8 +104,6 @@ minetest.register_node("ferns:fern_01", {
 -- Spawning
 -----------------------------------------------------------------------------------------------
 
-assert(abstract_ferns.config.enable_lady_fern == true)
-
 if abstract_ferns.config.lady_ferns_near_tree == true then
 	plantslib:register_generate_plant({ -- near trees (woodlands)
 		surface = {

ferns/gianttreefern.lua

@@ -8,6 +8,8 @@
 -- Supports:				vines			
 -----------------------------------------------------------------------------------------------
 
+assert(abstract_ferns.config.enable_giant_treefern == true)
+
 -- lot of code, lot to load
 
 abstract_ferns.grow_giant_tree_fern = function(pos)
@@ -275,8 +277,6 @@ minetest.register_abm({
 -- GENERATE GIANT TREE FERN
 -----------------------------------------------------------------------------------------------
 
-assert(abstract_ferns.config.enable_giant_treefern == true)
-
 -- in jungles
 if abstract_ferns.config.enable_giant_treeferns_in_jungle == true then
 	plantslib:register_generate_plant({

ferns/horsetail.lua

@@ -9,6 +9,8 @@
 -- Supports:				dryplants, stoneage, sumpf			
 -----------------------------------------------------------------------------------------------
 
+assert(abstract_ferns.config.enable_horsetails == true)
+
 abstract_ferns.grow_horsetail = function(pos)
 	local horsetail_size = math.random(1,4)
 	if 	   horsetail_size == 1 then
@@ -125,8 +127,6 @@ end
 -- Generating
 -----------------------------------------------------------------------------------------------
 
-assert(abstract_ferns.config.enable_horsetails == true)
-
 if abstract_ferns.config.enable_horsetails_on_grass == true then
 	plantslib:register_generate_plant({
 		surface = {

ferns/treefern.lua

@@ -7,6 +7,8 @@
 -- Looked at code from:		default	, trees			
 -----------------------------------------------------------------------------------------------
 
+assert(abstract_ferns.config.enable_treefern == true)
+
 abstract_ferns.grow_tree_fern = function(pos)
 	local size = math.random(1,5)
 	local crown = math.random(1,2)
@@ -189,8 +191,6 @@ minetest.register_abm({
 -- GENERATE TREE FERN
 -----------------------------------------------------------------------------------------------
 
-assert(abstract_ferns.config.enable_treefern == true)
-
 -- in jungles
 if abstract_ferns.config.enable_treeferns_in_jungle == true then
 	plantslib:register_generate_plant({