Fixed bug: all objects with a specific label cannot be displayed if a…

[bsekachev]

…t least one tag with the label exist

Motivation and context

Resolve #2418

How has this been tested?

Manual testing
@dvkruchinin Hi, could you please write a test to check this issue?

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

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) 2020 Intel Corporation
#
# SPDX-License-Identifier: MIT

[dvkruchinin]

Hi. Yes, of course. I will write a test to test this fix.

[coveralls]

Coverage remained the same at 62.831% when pulling 926d19b on bs/fixed_issue_2418 into a9b2817 on develop.