Fix clawback handling for empty or expired pools

[Kings9595]

Investigate and patch clawback logic so empty or expired pools are handled consistently and rejected only when appropriate.

[heymide]

@heymide has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I've reviewed the task and have a clear implementation plan. Looking forward to contributing with a quality PR.

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[shelterfaithapps]

@shelterfaithapps has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

"Hi maintainers, I would like to work on this issue. Please assign it to me if it's still available."

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[devgbmuyiwa]

@devgbmuyiwa has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hello can i work on this issue

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[Osifowora]

@Osifowora has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

​Hi maintainer, I would love to work on this issue. I can get started on it right away.

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[drips-wave]

Congratulations, @shelterfaithapps! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[drips-wave]

This issue has been completed by @shelterfaithapps as part of the Stellar Wave Program's 6th Wave 🥳

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