[FIX] Fix createFn being blocked by empty input validation

[willeastcott]

PR #485 introduced validation to prevent empty or whitespace-only tags in SelectInput. However, this broke use cases where createFn is specified, such as the Editor's Script Component Inspector "Create Script" button.

Changes

• Skip empty/whitespace validation when createFn is provided
• Allow createFn to receive empty input so it can handle the flow (e.g., show a dialog to prompt for input)
• Preserve the original PR Disallow empty or whitespace-only tags #485 fix for tag inputs that don't use createFn

Before

Clicking "Create Script" with empty input did nothing because:

1. The create label container was hidden for empty input
2. The click handler returned early before calling createFn

After

When createFn is specified:

• The create label remains visible with empty input
• Clicking it calls createFn(''), allowing the callback to handle empty values (e.g., show the script name picker dialog)

[Copilot]

Pull request overview

This PR fixes a regression where the createFn callback was being blocked by empty input validation introduced in PR #485. The fix allows components using createFn (like the Script Component Inspector's "Create Script" button) to handle empty inputs themselves, while preserving validation for regular tag inputs.

Key changes:

• Modified empty/whitespace validation to be conditional on the absence of createFn
• Updated both the create label visibility logic and click handler to skip validation when createFn is provided

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