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
TEST=`test_that -b $BOARD $DEV_HOST buffet_BasicDBusAPI`

Change-Id: Iaab3509430cb39eb65d29537a02ebf0b93c737dd
Reviewed-on: https://chromium-review.googlesource.com/274924
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
1 file changed