only alias tnt if tnt is not enabled

etc/Mods,WIP/mock_tnt/README.txt

@@ -9,6 +9,7 @@ Mod for Minetest
 * Does not harm any block or entity
 
 ## Known Issues
+* when TNT is enabled, there is no crafting recipe for mock_tnt
 * also ignite gunpowder with "default:torch", "fire:permanent_flame" (minetest_game only ignites via "fire:basic_flame", "default:lava_source", "default:lava_flowing") -- for some reason torch works already but permanent_flame does not
 * Make gunpowder ignite via "building_blocks:Fireplace"
 * Make TNT ignite via neighbors "throwing:arrow_fireworks_blue", "throwing:arrow_fireworks_red"

etc/Mods,WIP/mock_tnt/init.lua

@@ -35,10 +35,10 @@ end
 -- 	sounds = default.node_sound_sand_defaults(),
 -- })
 
-minetest.register_alias("tnt:tnt", "mock_tnt:mock_tnt")
 
 -- Only when "not" to not overlap tnt mod:
 if not enable_tnt then
+	minetest.register_alias("tnt:tnt", "mock_tnt:mock_tnt")
 	minetest.register_craft({
 		output = "mock_tnt:mock_tnt",
 		recipe = {