Fix OPTIONS request to REST API methods

[nmanovic]

Motivation and context

Now some requests with OPTIONS method to a REST API endpoint lead to an exception. For example, OPTIONS https://cvat.org/api/organizations -> 500 (Server Error). Others to permissions denied.

How has this been tested?

Added a test into tests/rest_api

Checklist

• I submit my changes into the develop branch
• I have added tests to cover my changes

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2022 Intel Corporation
#
# SPDX-License-Identifier: MIT