定时任务解绑任务时不应该报错

[hoganlxj]

What happened: 在定时任务详情 关联资源tab页，第一次解绑资源报错

Environment:

• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Version (e.g. kubectl get oc -n onecloud -o yaml | grep -C 3 version):

[hoganlxj]