If pyeclib dist is missing files then the isal loading would blow up with "TypeError: 'NoneType' object is not iterable". This patch changes that to a RuntimeError with a more useful message. Change-Id: I64a85eb739fb72efe41f1ee829e463167246b793 Closes-Bug: #2120591 Signed-off-by: Alistair Coles <alistairncoles@gmail.com>