更新bug

@@ -194,7 +194,7 @@ func (postData postPurposeOrderDetail) Valid() error {
 	if len(postData.OrderDist) == 0 {
 	if len(postData.OrderDist) == 0 {
 		return lib.ThrowError(lib.ARG_ERROR, "订单区域必填")
 		return lib.ThrowError(lib.ARG_ERROR, "订单区域必填")
 	}
 	}
-	if len(postData.Product) > 0 {
+	if len(postData.Product) == 0 {
 		return lib.ThrowError(lib.ARG_ERROR, "货品列表必填")
 		return lib.ThrowError(lib.ARG_ERROR, "货品列表必填")
 	}
 	}
 	if len(postData.Product) > 50 {
 	if len(postData.Product) > 50 {