Providing an empty set of roles is permitted to generate an empty
configuration from the pipeline handlers.
Overload the generateConfiguration() function such that not specifying a
roles parameter will use an empty set, and return an empty
configuration.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
d35cf6e4e4