修正列印牌位異常，修正報名新增功德項目，避免用到不存在的套表造成null pointer

web/App_Code/api/activityController.cs

@@ -1,4 +1,5 @@
 using DocumentFormat.OpenXml.Drawing.Spreadsheet;
+using Microsoft.Ajax.Utilities;
 using MINOM.COM.Utility;
 using Model;
 using Newtonsoft.Json;
@@ -824,13 +825,13 @@ public class activityController : ApiController
                     //price = (_activity_id > 0) ?  (relatingDt.Where(o => o.actItem_num == x.num).Select(o => o.price).FirstOrDefault()?? x.price)   : (x.price ) , //預設金額,有活動抓活動預設,沒活動抓品項預設
                     price = (_activity_id > 0) ? (x.activity_relating.Select(o => o.price).FirstOrDefault() ?? x.price) : (x.price), //預設金額,有活動抓活動預設,沒活動抓品項預設
                     customize_data = x.customize_data ?? "",
-                    files = x.actItem_files.Select(f => new
+                    files =x.actItem_files!=null? x.actItem_files.Select(f => new
                     {
                         num = f.file.num,
                         subject = f.file.subject,
                         word = f.file.word,
                         cuz_column = f.file.customize_data ?? "", //定義欄位需求
-                    }),
+                    }):null,
                 }),
                 count = count
             };