fix: Resolve issue with empty node set

[dexters1]

Description

Transform default node set value needed for FastAPI to default value needed by Cognee

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• Performance improvement
• Other (please specify):

Screenshots/Videos (if applicable)

Pre-submission Checklist

• I have tested my changes thoroughly before submitting this PR
• This PR contains minimal changes necessary to address the issue/feature
• My code follows the project's coding standards and style guidelines
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if applicable)
• All new and existing tests pass
• I have searched existing PRs to ensure this change hasn't been submitted already
• I have linked any relevant issues in the description
• My commits have clear and descriptive messages

DCO Affirmation

I affirm that all code in every commit of this pull request conforms to the terms of the Topoteretes Developer Certificate of Origin.

[pull-checklist]

Please make sure all the checkboxes are checked:

• I have tested these changes locally.
• I have reviewed the code changes.
• I have added end-to-end and unit tests (if applicable).
• I have updated the documentation and README.md file (if necessary).
• I have removed unnecessary code and debug statements.
• PR title is clear and follows the convention.
• I have tagged reviewers or team members for feedback.

[pull-checklist]

Please make sure all the checkboxes are checked:

• I have tested these changes locally.
• I have reviewed the code changes.
• I have added end-to-end and unit tests (if applicable).
• I have updated the documentation and README.md file (if necessary).
• I have removed unnecessary code and debug statements.
• PR title is clear and follows the convention.
• I have tagged reviewers or team members for feedback.

[pull-checklist]

Please make sure all the checkboxes are checked:

• I have tested these changes locally.
• I have reviewed the code changes.
• I have added end-to-end and unit tests (if applicable).
• I have updated the documentation and README.md file (if necessary).
• I have removed unnecessary code and debug statements.
• PR title is clear and follows the convention.
• I have tagged reviewers or team members for feedback.

[pull-checklist]

Please make sure all the checkboxes are checked:

• I have tested these changes locally.
• I have reviewed the code changes.
• I have added end-to-end and unit tests (if applicable).
• I have updated the documentation and README.md file (if necessary).
• I have removed unnecessary code and debug statements.
• PR title is clear and follows the convention.
• I have tagged reviewers or team members for feedback.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch remove-empty-nodeset

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