torches break when not supported

mods/pmb_nodes/pmb_lights/init.lua

@@ -27,6 +27,11 @@ minetest.register_node("pmb_lights:torch", {
     groups = { dig_immediate = 3, deco_block = 1, },
     sounds = pmb_sounds.default_stone(),
     after_place_node = pmb_lights.on_place_torch,
+    _on_node_update = function(pos, cause, user, count, payload)
+      if pmb_util.has_adjacent(pos, "suffocates") == 0 then
+        minetest.dig_node(pos)
+      end
+    end
 })
 
 minetest.register_craft({