Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). This card can be treated as 2 Tributes for the Tribute Summon of a "Performapal" monster.
--EMレビュー・ダンサー
--Performapal Revue Dancer
local s,id=GetID()
function s.initial_effect(c)
	--special summon rule
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.sprcon)
	c:RegisterEffect(e1)
	--double tribute
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_DOUBLE_TRIBUTE)
	e2:SetValue(s.dtcon)
	c:RegisterEffect(e2)
end
s.listed_series={SET_PERFORMAPAL}
function s.sprcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)==0
		and Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)>0
		and Duel.GetLocationCount(tp,LOCATION_MZONE)>0
end
function s.dtcon(e,c)
	return c:IsSetCard(SET_PERFORMAPAL)
end