Accept Merge Request #2034: (feature/6694 -> develop)

Merge Request: 修复bug

Created By: @胡尧
Accepted By: @胡尧
URL: https://jikimo-hn.coding.net/p/jikimo_sfs/d/jikimo_sf/git/merge/2034?initial=true

sf_machine_connect/models/ftp_operate.py

@@ -160,6 +160,8 @@ def transfer_nc_files(
             source_ftp_info['username'],
             source_ftp_info['password']
         )
+        if not source_ftp.ftp:
+            raise Exception("编程文件FTP连接失败")
         source_ftp.ftp.set_pasv(1)
         
         # 连接目标FTP
@@ -169,6 +171,8 @@ def transfer_nc_files(
             target_ftp_info['username'],
             target_ftp_info['password']
         )
+        if not source_ftp.ftp:
+            raise Exception("机床FTP连接失败")
         source_ftp.ftp.set_pasv(1)
 
         # 递归遍历源目录