Searching frames without annotation

[aschernov]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

Please, develop a setting or a filter to quickly find frames without any annotated objects at all.

Current Behaviour

There is no corresponding option to quickly find such frames

Possible Solution

Steps to Reproduce (for bugs)

Context

This option is necessary to improve validation processes and quickly find missed frames.

Your Environment

• Git hash commit (git log -1):
• Docker version docker version (e.g. Docker 17.0.05):
• Are you using Docker Swarm or Kubernetes?
• Operating System and version (e.g. Linux, Windows, MacOS):
• 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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[bsekachev]

Duplicate of #284