Write GRUB_CMDLINE_LINUX directly to custom grub.d file if available
Write GRUB_CMDLINE_LINUX directly to custom grub.d file if available

and short circuit, rather than doing the sed thing on a potentially nonexistent
or empty file.

Acidburn0zzz/worker,Acidburn0zzz/worker,solarce/worker,henrikhodne-abandoned/worker,solarce/worker,henrikhodne-abandoned/worker,henrikhodne-abandoned/worker,Acidburn0zzz/worker,travis-ci/worker,solarce/worker,travis-ci/worker,travis-ci/worker