fix: product logo is received null from prisma if not set

[ShubhamPalriwala]

What does this PR do?

Go to the Look & Feel page on Production, try to update the product. In your browser console, you should see an error. This is because in the service, we get the product from DB & validate it again, and the DB returns the new logo as null whereas currently it accepts it to be an empty object. This PR fixes that.

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• 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 Formbricks Docs if changes were necessary

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2 Ignored Deployments

Name	Status	Preview	Updated (UTC)
formbricks-cloud	⬜️ Ignored (Inspect)		Apr 5, 2024 9:42pm
formbricks-com	⬜️ Ignored (Inspect)		Apr 5, 2024 9:42pm

[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[pandeymangg]

LGTM!