remove unused code and fix some nil error

init.lua

@@ -42,7 +42,6 @@ minetest.register_on_mods_loaded(function()
     minetest.display_chat_message("rumble mod loaded. May the rumble be with you!")
     log = log_and_chat
     log_mode = "log and chat"
-    chatmode = off
 end)
 
 -- step 2 (take damage)
@@ -78,8 +77,15 @@ minetest.register_on_receiving_chat_message(function(message)
     end
 end)
 
+-- step 6 (item use test and node place tests)
 
--- step 6 (commands)
+--minetest.register_on_item_use(function(itemstack, pointed_thing)
+--    log("itemstack: "..tostring(itemstack))
+--    log("pointed thing: "..dump(pointed_thing))
+--end)
+
+
+-- step 7 (commands)
 
 -- command 1
 minetest.register_chatcommand("settings", {
@@ -186,8 +192,8 @@ minetest.register_chatcommand("notifications_off", {
 -- command 10
 minetest.register_chatcommand("chat_trigger", {
     description = "if set, will only trigger notification rumbles for a specific word or name typed after the command",
-    func = function()
+    func = function(text)
         chat_trigger = text
-        minetest.display_chat_message("notification trigger: "..chat_trigger)
+        minetest.display_chat_message("notification trigger: "..tostring(chat_trigger))
     end,
 })