Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
While you control a monster, you take no battle damage.
--スピリットバリア
--Spirit Barrier
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--avoid battle damage
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_AVOID_BATTLE_DAMAGE)
	e2:SetRange(LOCATION_SZONE)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetTargetRange(1,0)
	e2:SetCondition(s.condition)
	c:RegisterEffect(e2)
end
function s.condition(e)
	return Duel.GetFieldGroupCount(e:GetHandlerPlayer(),LOCATION_MZONE,0)>0
end