"Regulus' Arrow" fix

The GY effect wasn't checking that the player had an available Monster Zone.

Author: pyrQ

pre-release/c100450020.lua

@@ -72,7 +72,8 @@ function s.spfilter(c,e,tp)
 end
 function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
 	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.spfilter(chkc,e,tp) end
-	if chk==0 then return Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
+	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
+		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
 	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
 	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
 	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,tp,0)
@@ -82,4 +83,4 @@ function s.spop(e,tp,eg,ep,ev,re,r,rp)
 	if tc:IsRelateToEffect(e) then
 		Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
 	end
-end
+end