fix crash on balrog dead if not enabled tnt explosion

* closes https://codeberg.org/minenux/minetest-mod-mobs_balrog/issues/4

README.md

@@ -62,7 +62,7 @@ Changelog [changelog.md](changelog.md)
 
 ## Dependencies: 
 
-* tnt, default, from basic games, 
+* tnt, default, from basic games, `enable_tnt` if set to true balrog will explode in epic way
 * mobs (or so called mobs_redo)
 * intllib if you are using minetest 0.4 series and only optional
 

init.lua

@@ -130,6 +130,7 @@ if (PATH_FINDER == nil) then
 	PATH_FINDER = 1
 end
 
+local enable_tnt = minetest.settings:get_bool("enable_tnt") or false
 
 local spawn_nodes = {"group:stone"}
 if minetest.get_modpath("nether") then 
@@ -219,6 +220,7 @@ mobs:register_mob("mobs_balrog:balrog", {
 				texture = "fire_basic_flame.png",
 				collisiondetection = true,
 			})
+			if enable_tnt then
 				tnt.boom(pos, {
 					name = "Balrog's Blast",
 					radius = 14,
@@ -228,6 +230,7 @@ mobs:register_mob("mobs_balrog:balrog", {
 					ignore_on_blast = false,
 					tiles = {""},
 				})
+			end
 		end)
 	end,
 })