[SelectPanel] Fix issue causing no error banner to appear when there are no matches

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What are you trying to accomplish?

The SelectPanel component has a bug preventing the error banner from appearing if the previous filter operation produced no results.

Screenshots

Before

before.mov

After

after.mov

Integration

No changes necessary in production.

List the issues that this change affects.

Fixes https://github.com/github/primer/issues/4260

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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[changeset-bot]

🦋 Changeset detected

Latest commit: b1398c1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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