Collecting per-board abuild.xml is bound to fail if there
are no such files.
Change-Id: I6bd6b4389beda51654005e0380f0e52f006642db
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/422
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>