If /proc//attr/apparmor/current exists, only read that - instead of falling back to /proc//attr/current if a process is for example unconfined so that read_proc_current returns None.
Fixes: #199 (closed)
I propose this patch for 3.0 and master.
2.13 and older only check /proc/*/attr/current. If we want to change that, we'll need to backport some more commits, or maybe just copy over the latest aa-unconfined.