private Map<String, Map<EntityAction, List<Handler>>> getHandlers() {
        if (!initialised) {
            initialise();
        }

        return handlers;
    }
Check to see if we can find a handler for this event. If there isn't one
then there is no point in firing the event.
stroom-core/src/main/java/stroom/core/entity/event/EntityEventHandler.java