fix(llm): 🚦 do not validate empty Stellar memos

[thesan]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • ...

📝 Description

Remove invalid format error for Stellar empty hash and return type memo.

Before

Screen.Recording.2024-12-11.at.12.17.15.mov

After

Screen.Recording.2024-12-11.at.12.13.30.mov

❓ Context

• LIVE-15314

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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[cgrellard-ledger]

The Continue button isn't disabled anymore when we select a type other than No memo and the memo value is empty. Are we sure we want to let the user be able to go to the next step in this case ?

[thesan]

@cgrellard-ledger nice catch. As discussed internally I updated the logic so the type get's set to NO_MEMO when the value is empty.