!4940 apparmor: avoid crash when parsed profile name is empty

Merge Pull Request from: @ci-robot 
 
PR sync from: Xiang Yang <xiangyang3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/FUZCNOTYHPICVOQEWIPXMD4RVPG4DN5U/ 
 
https://gitee.com/src-openeuler/kernel/issues/I932W7 
 
Link:https://gitee.com/openeuler/kernel/pulls/4940

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>