ftools functions that expect data may get 'None'; this patch does this check
and return immediately if this is the case.
(From OE-Core rev: 5eaa4fa30e2362e6dd572b8a6f7a909b608e14bf)
Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>