Add invalid creator details read tests

[Chucks1093]

Summary

Add focused tests for invalid creator details reads.

Scope

• add tests for invalid creator detail read input
• verify expected return or error behavior
• keep the tests small and direct

Acceptance Criteria

• invalid creator detail read paths are covered by tests
• expected behavior is asserted clearly
• tests remain focused and maintainable

Contributor note: comment on the issue first and reach out in Telegram for updates or coordination: https://t.me/accesslayerorg

[Ayo-Skiller]

@Ayo-Skiller has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, I'm a fullstack smartcontract developer and i would like to work on this project

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ayo-Skiller to this issue.

[drips-wave]

Congratulations, @Ayo-Skiller! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Ayo-Skiller: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊