Fix crash when drinking milk when damage disabled

mods/PLAYER/mcl_hunger/init.lua

@@ -7,6 +7,13 @@ end
 
 
 mcl_hunger = {}
+
+-- This variable tells you if the hunger gameplay mechanic is active.
+-- IMPORTANT: If damage is disabled on load time, most of the functions are NOT
+-- available! Check if mcl_hunger is active before using the API.
+mcl_hunger.active = false
+
+
 mcl_hunger.exhaust = function() end
 
 mcl_hunger.HUD_TICK = 0.1
@@ -24,8 +31,6 @@ mcl_hunger.EXHAUST_LVL = 4000 -- at what exhaustion player saturation gets lower
 
 mcl_hunger.SATURATION_INIT = 5 -- Initial saturation for new/respawning players
 
-mcl_hunger.active = false
-
 if minetest.settings:get_bool("enable_damage") then
 mcl_hunger.active = true