Fix crash when model has no clipping masks

[shinshin86]

Models that contain zero clipping masks do not create renderer._clippingManager, so the first frame threw:

Cannot set properties of undefined (setting '_currentFrameNo')

Added an early-return guard:

if (!this.renderer._clippingManager) {
  return;
}

Nothing changes when a clipping manager is present; models without masks now load and render normally.

This appears to address the same symptom described in #12

I would appreciate your review—thank you!

[RaSan147]

Thanks a lot, I had little to no knowledge in the underlying render pipeline. Will test and approve.

[RaSan147]

Can you kindly run the CI action in your repo and share the link. Then we can approve

[shinshin86]

Hi @RaSan147 ,

I found that the previous failure was caused by an incorrect ref value in the workflow, which I’ve now removed. (686d282)

The workflow runs successfully in my fork.
https://github.com/shinshin86/pixi-live2d-display-lipsyncpatch/actions/runs/14697024806

Could you please click “Approve and run” so the CI can execute on this PR?
If anything still breaks, I’ll fix it right away.

Thanks for your help!

[RaSan147]

Looks good, merging. Thanks a lot for all your help. 🤩