Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If your opponent controls a card and you control no cards, you can Normal Summon this card without Tributing. If this card attacks an opponent's monster, as long as you control no Spell/Trap Cards, your opponent cannot activate any Spell/Trap Cards until the end of the Damage Step.
--ハンマーラッシュ・バウンサー
--Hammer Bounzer
local s,id=GetID()
function s.initial_effect(c)
	--summon with no tribute
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SUMMON_PROC)
	e1:SetCondition(s.ntcon)
	c:RegisterEffect(e1)
	--actlimit
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_CONTINUOUS)
	e2:SetCode(EVENT_ATTACK_ANNOUNCE)
	e2:SetCondition(s.atkcon)
	e2:SetOperation(s.atkop)
	c:RegisterEffect(e2)
end
function s.ntcon(e,c,minc)
	if c==nil then return true end
	return minc==0 and c:GetLevel()>4 and Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
		and Duel.GetFieldGroupCount(c:GetControler(),LOCATION_ONFIELD,0,nil)==0
		and Duel.GetFieldGroupCount(c:GetControler(),0,LOCATION_ONFIELD,nil)>0
end
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetAttackTarget()~=nil
		and not Duel.IsExistingMatchingCard(Card.IsSpellTrap,tp,LOCATION_ONFIELD,0,1,nil)
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EFFECT_CANNOT_ACTIVATE)
	e1:SetTargetRange(0,1)
	e1:SetValue(s.aclimit)
	e1:SetReset(RESET_PHASE|PHASE_DAMAGE)
	Duel.RegisterEffect(e1,tp)
end
function s.aclimit(e,re,tp)
	return re:IsHasType(EFFECT_TYPE_ACTIVATE)
end