Fix ZeroDivisionError in wikipedia_report.py on empty data

[pranjal2004838]

Fixes

• Fixes Unhandled ZeroDivisionError Risk in wikipedia_report.py on Empty Data #301 by @pranjal2004838

Description

Prevents ZeroDivisionError in wikipedia_report.py when the Wikipedia dataset contains headers but has no data rows (empty data). In this case, len(data) evaluates to 0, leading to division by zero. This PR adds a guard check to default the average number of articles to 0 when there is no data.

Technical details

Adds a ternary operator check:
average_articles = total_articles / len(data) if len(data) > 0 else 0

Tests

1. Run python scripts/3-report/wikipedia_report.py with an empty or headers-only CSV file in the active quarters data directory.
2. Verify the script runs successfully without raising a ZeroDivisionError.

Screenshots

Checklist

• I have read and understood the Developer Certificate of Origin (DCO), below, which covers the contents of this pull request (PR).
• My pull request doesn't include code or content generated with AI (also see Avoiding generative AI development tools — Creative Commons Open Source).
• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated unit tests and/or test scripts for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[TimidRobot]

thank you!