If sdk ins't in BUILDHISTORY_FEATURES the get_extra_sdkinfo fails
because no information about sdk is generated in buildhistory repo.
(From OE-Core rev: e6a0ea6146171635c49b18e00b4b11a9a7ff20ee)
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>