Export annotation error for cuboid

[azhavoro]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Export annotation for a task with cuboid shapes leads to a server exception for all formats except CVAT.

Expected Behaviour

Cuboid shapes should be ignored (discussed with Maxim).

Current Behaviour

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/rq/worker.py", line 812, in perform_job
    rv = job.perform()
  File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 588, in perform
    self._result = self._execute()
  File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 594, in _execute
    return self.func(*self.args, **self.kwargs)
  File "/home/django/cvat/apps/dataset_manager/views.py", line 87, in export_task_annotations
    return export_task(task_id, dst_format, server_url=server_url, save_images=False)
  File "/home/django/cvat/apps/dataset_manager/views.py", line 62, in export_task
    server_url=server_url, save_images=save_images)
  File "/home/django/cvat/apps/dataset_manager/task.py", line 723, in export_task
    save_images=save_images)
  File "/home/django/cvat/apps/dataset_manager/task.py", line 619, in export
    exporter(dst_file, task_data, **options)
  File "/home/django/cvat/apps/dataset_manager/formats/registry.py", line 35, in __call__
    f_or_cls(*args, **kwargs)
  File "/home/django/cvat/apps/dataset_manager/formats/mot.py", line 20, in _export
    extractor = CvatTaskDataExtractor(task_data, include_images=save_images)
  File "/home/django/cvat/apps/dataset_manager/bindings.py", line 425, in __init__
    dm_anno = self._read_cvat_anno(frame_data, task_data)
  File "/home/django/cvat/apps/dataset_manager/bindings.py", line 522, in _read_cvat_anno
    raise Exception("Unknown shape type '%s'" % shape_obj.type)
Exception: Unknown shape type 'cuboid'

Possible Solution

Filter unsupported shapes

Steps to Reproduce (for bugs)

1. Create a new cuboid shape
2. Try to dump in COCO format

Context

Your Environment

• Git hash commit (git log -1): 42fb305
• Docker version docker version (e.g. Docker 17.0.05): 19.03.08
• Are you using Docker Swarm or Kubernetes? no
• Operating System and version (e.g. Linux, Windows, MacOS): ubuntu 18.04
• 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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