Error on null bundle.

Quick patch with check for $variation.

Thanks for the report & patch Dylan. I think my decision to use the default variation bundle is broken now that https://www.drupal.org/project/commerce/issues/3089040 ✨ Single product with multiple variation types Fixed is in core.

I've made a change to get the bundle of the variation being presented for purchase. It's a bit convoluted so if you can test it and let me know if you see a better route that would be awesome.

Automatically closed - issue fixed for 2 weeks with no activity.