diffusers

a7de9650 - Fix unipc use_karras_sigmas exception - fixes huggingface/diffusers#4580 (#4581)

Fix unipc use_karras_sigmas exception - fixes huggingface/diffusers#4580 (#4581) * Fix unipc karras sigmas exception - fixes huggingface/diffusers#4580 * Add unipc scheduler tests for karras sigmas