* Fix add-layer error message when a layer is already in BBLAYERS
* Ensure we show an error message if we can't find BBLAYERS at all
(Bitbake rev: 1c743fd2103730e27699dd55efc6914d3b0c3702)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>