Fix: correctly identify empty frames for useSpriteLoader

[netgfx]

Why

Some spritesheets might contain empty frames, this fix correctly discards those from the end results so the animation is accurate

What

Added the functionality for empty frames to be excluded from the useSpriteLoader result (for spritesheets without a JSON)

Checklist

• [ ] Documentation updated (example)
• [ ] Storybook entry added (example)
• [x ] Ready to be merged

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Name	Status	Preview	Comments	Updated (UTC)
drei	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 10, 2024 8:01pm

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