[#34] Third step of not using Bio as Attribute

Elwig/Helpers/Utils.cs

@@ -364,7 +364,7 @@ namespace Elwig.Helpers {
             var varieties = ctx.WineVarieties.Select(v => new RawVaribute(v.SortId, "", null)).ToList();
             var delivered = ctx.DeliveryParts
                .Where(d => d.Year == year)
-               .Select(d => new RawVaribute(d.SortId, d.AttrId ?? "", d.CultId))
+               .Select(d => new RawVaribute(d.SortId, d.AttrId ?? "", d.CultId ?? ""))
                .Distinct()
                .ToList();
             return [.. (onlyDelivered ? delivered : delivered.Union(varieties)).Order()];