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f2756253 - Fix a bug in `AutoPipeline.from_pipe` when switching pipeline with optional components (#6820)

Fix a bug in `AutoPipeline.from_pipe` when switching pipeline with optional components (#6820) * fix * add tests --------- Co-authored-by: yiyixuxu <yixu310@gmail,com> Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>