If for some unknown reason, the kernel git repository hasn't been properly
updated and is *older* than the revisions listed in default-revisions the
branch sanity checking kicks in and tries to force branches to the right
revs. The problem is, the revisions it is looking for don't exist in the
tree. As a result, error messages are thrown about invalid commit IDs.
These aren't helpful, and are simply confusing for the user.
Instead we can test for the commit ID, and if it isn't valid, indicate
that the commit ID isn't valid and that the tree is potentially out
of sync.
This situation is not common, but it is an easy test and the extra
sanity checking is useful.
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
