After express installing Debian 8 without setting a password for the user* I noticed tha the root password is set to "dummyPa55w0rd". I've also checked that there is some tentative for deleting this set password. IMO, root password must be required instead of optional. *: https://bugzilla.redhat.com/show_bug.cgi?id=1336108
Fixed by commit https://gitlab.com/libosinfo/libosinfo/commit/05091691c3b7c151307868e96fbc6fab611ac3bb, which will be part of 0.3.1 release.