fix buggy protector interface exit (#7)

Some small fixes.

protector/init.lua

@@ -15,22 +15,17 @@ protector.node = "protector:protect"
 protector.item = "protector:stick"
 
 protector.get_member_list = function(meta)
-	s = meta:get_string("members")
-	list = s:split(" ")
+	local s = meta:get_string("members")
+	local list = s:split(" ")
 	return list
 end
 
 protector.set_member_list = function(meta, list)
-	s = ""
-	for _, i in ipairs(list) do
-		s = s .. i .. " "
-	end
-	s = s:sub(0,s:len()-1) -- remove last space
-	meta:set_string("members",s)
+	meta:set_string("members", table.concat(list, " "))
 end
 
 protector.is_member = function (meta, name)
-	list = protector.get_member_list(meta)
+	local list = protector.get_member_list(meta)
 	for _, n in ipairs(list) do
 		if n == name then
 			return true
@@ -41,13 +36,13 @@ end
 
 protector.add_member = function(meta, name)
 	if protector.is_member(meta, name) then return end
-	list = protector.get_member_list(meta)
+	local list = protector.get_member_list(meta)
 	table.insert(list,name)
 	protector.set_member_list(meta,list)
 end
 
 protector.del_member = function(meta,name)
-	list = protector.get_member_list(meta)
+	local list = protector.get_member_list(meta)
 	for i, n in ipairs(list) do
 		if n == name then
 			table.remove(list, i)
@@ -59,7 +54,7 @@ end
 
 protector.generate_formspec = function (meta)
 	if meta:get_int("page") == nil then meta:set_int("page",0) end
-	formspec = "size[8,8]"
+	local formspec = "size[8,8]"
 		.."label[0,0;-- Protector interface --]"
 		.."label[0,1;Punch the node to show the protected area.]"
 		.."label[0,2;Current members:]"
@@ -147,8 +142,9 @@ local old_node_dig = minetest.node_dig
 function minetest.node_dig(pos, node, digger)
 	local ok=true
 	if node.name ~= protector.node then
-	ok = protector.can_dig(5,pos,digger)
-	else ok = protector.can_dig(5,pos,digger,true)
+		ok = protector.can_dig(5,pos,digger)
+	else
+		ok = protector.can_dig(5,pos,digger,true)
 	end
 	if ok == true then
 		old_node_dig(pos, node, digger)
@@ -174,10 +170,10 @@ function minetest.item_place(itemstack, placer, pointed_thing)
 	end	
 	return old_node_place(itemstack, placer, pointed_thing)
 end
-protect = {}
+local protect = {}
 minetest.register_node(protector.node, {
 	description = "Protection",
-	tile_images = {"protector_top.png","protector_top.png","protector_side.png"},
+	tiles = {"protector_top.png","protector_top.png","protector_side.png"},
 	sounds = default.node_sound_stone_defaults(),
 	groups = {dig_immediate=2},
 	drawtype = "nodebox",
@@ -257,10 +253,12 @@ minetest.register_on_player_receive_fields(function(player,formname,fields)
 		if fields.protector_page_next then
 			meta:set_int("page",meta:get_int("page")+1)
 		end
-		minetest.show_formspec(
-			player:get_player_name(), formname,
-			protector.generate_formspec(meta)
-		)
+		if not fields.quit then
+			minetest.show_formspec(
+				player:get_player_name(), formname,
+				protector.generate_formspec(meta)
+			)
+		end
 	end
 end)
 
@@ -276,7 +274,7 @@ minetest.register_craftitem(protector.item, {
 })
 
 minetest.register_craft({
-	output = '"' .. protector.node .. '" 4',
+	output = protector.node .. " 4",
 	recipe = {
 		{"default:stone","default:stone","default:stone"},
 		{"default:stone","default:steel_ingot","default:stone"},