If SERIAL_CONSOLES is set to empty for some reason, we would have rootfs
failure like below.
- nothing provides systemd-serialgetty needed by systemd-1:234-r0.core2_64
This is because systemd-serialgetty package is not generated when
SERIAL_CONSOLES is empty.
Set ALLOW_EMPTY to "1" for this recipe to allow for generation of empty
systemd-serialgetty package to avoid the above error.
(From OE-Core rev: abf2e9526a11bcb51b71b90a7b76bd33af656494)
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>