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Invalid date

1. Fix bug: the snapshot will disappear and turn to white in device list;
2. Fix bug: it will not show the picture of no device when there is no device;
3. Show the information of video file in camera and enable the function of deletion;
4. Fix bug: avoid APP crash when starting up;
5. Add notice when the password is too short or simple;
6. Add guide page for adding the device.