Merge "Camera: Handle ISE when device state manager is absent" into sc-v2-dev

        mHandlerThread.start();

        mHandler = new Handler(mHandlerThread.getLooper());

        mFoldStateListener = new FoldStateListener(context);

        try {

            context.getSystemService(DeviceStateManager.class)

                    .registerCallback(new HandlerExecutor(mHandler), mFoldStateListener);

        } catch (IllegalStateException e) {

            Log.v(TAG, "Failed to register device state listener!");

            Log.v(TAG, "Device state dependent characteristics updates will not be functional!");

            mHandlerThread.quitSafely();

            mHandler = null;

            mFoldStateListener = null;

        }

    }

    private HandlerThread mHandlerThread;

        synchronized (mLock) {

            DeviceStateListener listener = chars.getDeviceStateListener();

            listener.onDeviceStateChanged(mFoldedDeviceState);

            if (mFoldStateListener != null) {

                mDeviceStateListeners.add(new WeakReference<>(listener));

            }

        }

    }

    /**

     * Return the list of currently connected camera devices by identifier, including