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e4f6c379 - [DiffusionPipeline] Deprecate not throwing error when loading non-existant variant (#4011)

[DiffusionPipeline] Deprecate not throwing error when loading non-existant variant (#4011) * Deprecate variant nicely * make style * Apply suggestions from code review Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> * Apply suggestions from code review Co-authored-by: Pedro Cuenca <pedro@huggingface.co> --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> Co-authored-by: Pedro Cuenca <pedro@huggingface.co>