register white octagon glass only if unified dyes available

nodes.lua

@@ -1,3 +1,5 @@
+local has_unifieddyes_mod = minetest.get_modpath("unifieddyes")
+local has_moreblocks_mod = minetest.get_modpath("moreblocks")
 
 --nodes
 
@@ -402,7 +404,8 @@ minetest.register_node("scifi_nodes:octppl", {
 	sounds = scifi_nodes.node_sound_glass_defaults(),
 })
 
-minetest.register_node("scifi_nodes:octwht", {
+if has_unifieddyes_mod then
+	minetest.register_node("scifi_nodes:octwht", {
 		description = "Octagon Glass",
 		sunlight_propagates = false,
 		drawtype = "glasslike",
@@ -422,7 +425,8 @@ minetest.register_node("scifi_nodes:octwht", {
 		sounds = scifi_nodes.node_sound_glass_defaults(),
 		on_construct = unifieddyes.on_construct,
 		on_dig = unifieddyes.on_dig
-})
+	})
+end
 
 minetest.register_node("scifi_nodes:tower", {
 	description = "Wind tower",
@@ -541,9 +545,6 @@ local f = assert(io.open(minetest.get_modpath("scifi_nodes") .. "/nodes.json", "
 local nodes = assert(minetest.parse_json(f:read("*all")))
 f:close()
 
-local has_unifieddyes_mod = minetest.get_modpath("unifieddyes")
-local has_moreblocks_mod = minetest.get_modpath("moreblocks")
-
 -- register all nodes
 for name, def in pairs(nodes) do