If the package doesn't contain any file, then the license isn't relevant
as far as the final image is concerned. So we skip the license checking
in license_create_manifest if such case.
(From OE-Core rev: f7b6684d2248f4a56e70b292891f9a454275449d)
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>