partly fix Cupid Pitch (#2014)

c21915012.lua

@@ -43,8 +43,17 @@ end
 function c21915012.valcheck(e,c)
 	local g=c:GetMaterial()
 	local mg=g:Filter(Card.IsType,nil,TYPE_TUNER)
-	if #mg==1 then
 	local tc=mg:GetFirst()
+	if not tc then
+		e:GetLabelObject():SetLabel(0)
+		return
+	end
+	if #mg>1 then
+		local tg=g-(g:Filter(Card.IsNotTuner,nil,c))
+		if #tg>0 then
+			tc=tg:GetFirst()
+		end
+	end
 	local lv=tc:GetSynchroLevel(c)
 	local lv2=lv>>16
 	lv=lv&0xffff
@@ -55,7 +64,6 @@ function c21915012.valcheck(e,c)
 		lv=2
 	end
 	e:GetLabelObject():SetLabel(lv)
-	end
 end
 function c21915012.lvcon(e,tp,eg,ep,ev,re,r,rp)
 	return e:GetHandler():IsSummonType(SUMMON_TYPE_SYNCHRO)
@@ -64,6 +72,7 @@ function c21915012.lvop(e,tp,eg,ep,ev,re,r,rp)
 	local c=e:GetHandler()
 	if c:IsFacedown() or not c:IsRelateToEffect(e) then return end
 	local ct=e:GetLabel()
+	if ct==0 then return end
 	local sel=nil
 	if c:IsLevel(1) then
 		sel=Duel.SelectOption(tp,aux.Stringid(21915012,1))