订单筛选功能优化

AllBase/Model/Result/PDDFrontProductInfo3.cs

@@ -203,7 +203,10 @@ namespace AllBase.Model.Result
 			set
 			{
 				_specs = value;
-				SpecNameStr = string.Join(",", value.Select(s => s.spec_value));
+				if (value != null)
+					SpecNameStr = string.Join(",", value.Select(s => s.spec_value));
+				else
+					SpecNameStr = "";
 			}
 		}
 		public int? price { get; set; } //  0,