Merge "Don't crash trying to unregister a receiver twice." into sc-dev

    @Override

    public void onDismiss(DialogInterface unused) {

        try {

            mContext.unregisterReceiver(mReceiver);

        } catch (IllegalArgumentException e) {

            // Don't crash if the receiver has already been unregistered.

            e.printStackTrace();

        }

        cleanUp();

    }