!4860 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/3O5JMFTNBFEQQHOBUY7UL27NA7PRRQIA/ 
 
https://gitee.com/src-openeuler/kernel/issues/I932W7 
 
Link:https://gitee.com/openeuler/kernel/pulls/4860

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>