Merge "Check for null executor" into qt-r1-dev

        try {

            IOns iOpportunisticNetworkService = getIOns();

            if (iOpportunisticNetworkService == null || availableNetworks == null) {

                if (executor == null || callback == null) {

                    return;

                }

                Binder.withCleanCallingIdentity(() -> executor.execute(() -> {

                    callback.accept(UPDATE_AVAILABLE_NETWORKS_INVALID_ARGUMENTS);

                }));