fix Gravekeeper's Oracle (#1772)

c25524823.lua

@@ -141,11 +141,16 @@ function c25524823.operation(e,tp,eg,ep,ev,re,r,rp)
 	end
 	if bit.band(sel,2)~=0 then
 		local g=Duel.GetMatchingGroup(c25524823.filter,tp,0,LOCATION_MZONE,nil)
+		if g:GetCount()>0 then
+			Duel.BreakEffect()
 			Duel.Destroy(g,REASON_EFFECT)
 		end
+	end
 	if bit.band(sel,4)~=0 then
 		local g=Duel.GetMatchingGroup(Card.IsFaceup,tp,0,LOCATION_MZONE,nil)
 		local tc=g:GetFirst()
+		if tc then
+			Duel.BreakEffect()
 			while tc do
 				local e1=Effect.CreateEffect(c)
 				e1:SetType(EFFECT_TYPE_SINGLE)
@@ -159,4 +164,5 @@ function c25524823.operation(e,tp,eg,ep,ev,re,r,rp)
 				tc=g:GetNext()
 			end
 		end
+	end
 end