respect protection when placing twigs

trunks/nodes.lua

@@ -42,6 +42,14 @@ for i in pairs(NoDe) do
 		liquids_pointable = true,
 		on_place = function(itemstack, placer, pointed_thing)
 			local pt = pointed_thing
+
+			if not placer then return end
+			local playername = placer:get_player_name()
+			if minetest.is_protected(pt.above, playername) then 
+				minetest.record_protection_violation(pt.above, playername)
+				return
+			end
+
 			local direction = minetest.dir_to_facedir(placer:get_look_dir())
 			if minetest.get_node(pt.above).name=="air" then
 				minetest.swap_node(pt.above, {name="trunks:twig_"..math.random(1,4), param2=direction})