fix: fixed the generate exercise with AI bug

[Chifez]

What does this PR do?

This bug fixes the console error when generating exercises with AI

Fixes #311

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] Chore (refactoring code, technical debt, workflow improvements)
• [ ] Enhancement (small improvements)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change adds a new database migration
• [ ] This change requires a documentation update

How should this be tested?

• Run on local host

  Checklist

Required

• [ ] Filled out the "How to test" section in this PR
• [ ] Self-reviewed my own code
• [ ] Commented on my code in hard-to-understand bits
• [ ] Ran pnpm build
• [ ] Checked for warnings, there are none
• [ ] Removed all console.logs
• [ ] Merged the latest changes from main onto my branch with git pull origin main
• [ ] My changes don't cause any responsiveness issues

Appreciated

• [ ] If a UI change was made: Added a screen recording or screenshots to this PR
• [ ] Updated the ClassroomIO Docs if changes were necessary

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