🧩 Problem

In memori/utils/validators.py, the namespace validator does not set a default value when the input is None, which can result in errors downstream.

📋 Steps to Fix

• Update validate_namespace to set a default value (e.g., "default") if the input is None or empty.
• Add test cases for None/empty values.

✅ Acceptance Criteria

• Namespace validator provides a safe default when input is None/empty.
• All uses of namespace in the codebase work without error.
• Documentation and tests updated.

Labels: hacktoberfest, bug, help wanted

Refer to memori/utils/validators.py

🤝 Hacktoberfest Details

• This issue is part of Hacktoberfest 2025 — valid pull requests will be merged or labeled hacktoberfest-accepted.
• Please review the CONTRIBUTING.md for contribution guidelines.
• Follow our Code of Conduct to maintain a positive and inclusive environment.

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