[Bug] The "occluded" attribute does not take at upload WiderFace 1.0 annotations.

[DmitriyOparin]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

The "occluded" attribute equals True.

Current Behaviour

The "occluded" attribute equals False.

Possible Solution

Fix this bug.

Steps to Reproduce (for bugs)

1.Create task with several images (type is png).
2.Draw 'Rectangle' (shape) in first frame.
3.Switch "occluded" to True.
4.Dump WiderFace 1.0 annotations.
5.Upload WiderFace 1.0 annotations.

Context

Your Environment

• Git hash commit (git log -1): ca97507
• Docker version docker version (e.g. Docker 17.0.05): N/A
• Are you using Docker Swarm or Kubernetes? No
• Operating System and version (e.g. Linux, Windows, MacOS): ubuntu 20.04
• Code example or link to GitHub repo or gist to reproduce problem:
• Other diagnostic information / logs:
  Logs from `cvat` container

Next steps

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