Comment # 5 on bug 1091521 from Martin Vidner

IMHO the file is strictly speaking optional for grub2(*), but in practice
required by yast. I think that allowing the file to be missing would complicate
yast further, with little gains.

Tomas, did you remove the file yourself, or did some other program do it?

*) Docs:
https://www.gnu.org/software/grub/manual/grub/grub.html#Simple-configuration