If wic is running as raw mode, it's better to check if BBLAYERS
is valid before inspect it.
No functional changes.
(From OE-Core rev: a3ee9cc7aebaecfa2223552a2c1865a9337de664)
Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>