优化删除作业

sstudy/src/main/java/com/xhkjedu/sstudy/service/paper/PaperService.java

      * @date 2020/6/9
      */
     public Integer delPaper(TPaper paper) {
+        Integer result = paperMapper.delPaper(paper.getPaperid());
         List<TPaperFile> pfilelist = paperFileService.listObjsByPaperid(paper.getPaperid());//获取作业文件夹
         if (N_Utils.isListNotEmpty(pfilelist)) {
             List<String> resourceUrls = new ArrayList<>();
             messageSender.resourceDel(resourceUrls);//给文件服务器发送mq删除文件
         }
 
-        return paperMapper.delPaper(paper.getPaperid());
+        return result;
     }
 
     /**