Bug: dev card page loads non-existent user

[nickytonline]

If the username for the dev card page does not exist, we should 404 the page instead of displaying a non-existent user dev card page.

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[open-sauced]

🎉 This issue has been resolved in version 2.55.3-beta.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[open-sauced]

🎉 This issue has been resolved in version 2.56.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀