Avoid a QA failure and instead produce a sensible warning message if no
modules were built.
Fixes [YOCTO #4791].
(From OE-Core rev: 3ef5b19cbd7a90e11fc61223737b0b8e0e60b1a3)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>