privetd: Remove empty device name checks

Server allows to have empty name. Buffet and privet also has no
requirement to have it not empty.

BUG=brillo:989
CQ-DEPEND=CL:274924
TEST=`FEATURES=test emerge-gizmo privetd buffet`

Change-Id: I02e141149d6eaf36a6c92676e68ab02b8287c724
Reviewed-on: https://chromium-review.googlesource.com/274883
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
3 files changed
tree: aca7e913e90b264ebce042bf9daa066633248382
  1. buffet/