Possibility of spaces in label (ICDAR)

[yasakova-anastasia]

Summary

How to test

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues)

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

[yasakova-anastasia]

@zhiltsov-max , the segmentation task assumes that the text will be a symbol. Do you think you need to do a similar check there?

[zhiltsov-max]

No, but it is a good place to raise an error, so the user could understand the problem.

[zhiltsov-max]

Please fill the description and update changelog.