[LoRA] improve failure handling for peft. (#10551)
* improve failure handling for peft.
* emppty
* Update src/diffusers/loaders/peft.py
Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>
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Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>