[pkg-apparmor] Bug#901559: apparmor fails to start with empty features-file=

[intrigeri]

Control: tag -1 + moreinfo

> AppArmor 2.13 fails to start if I set `features-file=` in parser.conf:

[...]

> Before, we used this to disable feature pinning, if I recall correctly.

I'm not sure: at least in previous versions of the conffile shipped in
the package, we commented out the features-file directive.

apparmor_parser(8) says that --features-file requires an argument
and "Config options are specified one per line using the same format as the
longform command line options (without the preceding --)" so the
behaviour you're observing, while maybe suboptimal, is the documented one.

Can you try to reproduce on Stretch and sid? If behaviour has changed,
it's a different matter :)