Comment # 3 on bug 1206042 from Takashi Iwai

(In reply to Dominique Leuenberger from comment #2)
> The tumbleweed kernel guards the scripts with run_if_exists, which is not
> done in the 15.4 kernel (yet)

Right, this is a fallout of commit ab8dd2da7f85757e683150af604f388b64e64c46, as
the kernel-*-optional handling is SLE15-SPx specific.
I'm going to fix it up for the next MU.