Added settings and warnings

modules/data/bonus.lua

@@ -12,6 +12,13 @@ require 'config.expcore.command_general_parse'
 --- Stores the bonus for the player
 local PlayerData = require 'expcore.player_data' --- @dep expcore.player_data
 local PlayerBonus = PlayerData.Settings:combine('Bonus')
+PlayerBonus:set_default(0)
+PlayerBonus:set_metadata{
+    stringify = function(value)
+        if not value or value == 0 then return 'None set' end
+        return (value*100)..'%'
+    end
+}
 
 --- Apply a bonus amount to a player
 local function apply_bonus(player, amount)