Comment # 2 on bug 963610 from Andrei Borzenkov

(In reply to Bj�rn Voigt from comment #0)
> If /etc/sysconfig/bootloader contains a commented line for LOADER_TYPE ...
> then "systemctl hibernate" does not call "grub2-once".

Which is correct. If we do not know what bootloader is used we should not
attempt to configure random bootloader.