For rebased git tree, some commits doesn't exist in any branch, and such commits are
valid in tag, the change is useful for such case.
(Bitbake rev: f594cb9f5a18dd0ab2342f96ffc6dba697b35f65)
Signed-off-by: Zhenhua Luo <zhenhua.luo@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>