出库单查询计划nullbug修改，后道标签内工单号逻辑修改

ZR.Service/mes/wms/WmOutOrderService.cs

@@ -1164,12 +1164,18 @@ namespace ZR.Service.mes.wms
                     item.MaterialCode,
                     item.BatchCode
                 );
-                item.Description = Context
+                var material = Context
                     .Queryable<WmMaterial>()
                     .Where(m => m.Partnumber == item.MaterialCode && m.Status == 1 && m.Type == 1)
-                    .Select(m => m.Description)
-                    .First()
-                    .ToString();
+                    .First();
+                if(material == null)
+                {
+                    item.Description = "无描述";
+                }
+                else
+                {
+                    item.Description = material.Description;
+                }
                 item.InventoryNumber = actualData.InventoryNumber;
                 item.ActualOutNumber = actualData.ActualOutNumber;
                 item.InventoryPackage = actualData.InventoryPackage;