Resolves smartstore#1030 Order export: does not export the data of the attribute combination

Author: mgesing

src/Libraries/SmartStore.Services/DataExchange/Export/DynamicEntityHelper.cs

@@ -939,6 +939,8 @@ private dynamic ToDynamic(DataExporterContext ctx, OrderItem orderItem)
 
 			dynamic result = new DynamicEntity(orderItem);
 
+			orderItem.Product.MergeWithCombination(orderItem.AttributesXml, _productAttributeParser.Value);
+
 			result.Product = ToDynamic(ctx, orderItem.Product);
 
 			return result;