This blacklist is needed to allow distros to "deselect" certain packages or images that are not vaild See https://bugzilla.yoctoproject.org/show_bug.cgi?id=2565#c2
One can blacklist images/packages using blacklist.bbclass. Cheers, Constantin
Verified in master: 09359e6ec00901abfe49157f1f9730117b4d284b . Blacklist class present and functional.