Do not try to rescan device in case of an error in DDS plugin.

Change-Id: I64b49294476fc3bbf77620d839b88b0ecea68e23
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Alex Char <prevedtest@gmail.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>