Add AllowNullable for the new properties in ProductsSearchRequest

Author: mvgreen

src/test/kotlin/com/ecwid/apiclient/v3/rule/nullablepropertyrules/ProductsSearchRequestRules.kt

@@ -24,5 +24,10 @@ val productsSearchRequestNullablePropertyRules: List<NullablePropertyRule<*, *>>
 	AllowNullable(ProductsSearchRequest.ByFilters::sku),
 	AllowNullable(ProductsSearchRequest.ByFilters::sortBy),
 	AllowNullable(ProductsSearchRequest.ByFilters::updatedFrom),
-	AllowNullable(ProductsSearchRequest.ByFilters::updatedTo)
+	AllowNullable(ProductsSearchRequest.ByFilters::updatedTo),
+	AllowNullable(ProductsSearchRequest.ByFilters::externalReferenceId),
+	AllowNullable(ProductsSearchRequest.ByFilters::isGiftCard),
+	AllowNullable(ProductsSearchRequest.ByFilters::discountsAllowed),
+	AllowNullable(ProductsSearchRequest.ByFilters::isCustomerSetPrice),
+	AllowNullable(ProductsSearchRequest.ByFilters::visibleInStorefront),
 )