FIX: JSON schema now is more permissive, and fixed if-conditions.

For #75 (closed), #103 (closed).

Summary

In the JSON schema:

• Fix authentication requirements.
• Allow more sections.

Focus

• Is the JSON schema still correct?
• Are all the cases covered in the tests?

Test Environment

pytest --no-cov unittests/test_schema.py

Check List for the Author

• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

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