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e4c356d3 - Fix for InstructPix2PixPipeline to allow for prompt embeds to be passed in without prompts. (#2456)

Fix for InstructPix2PixPipeline to allow for prompt embeds to be passed in without prompts. (#2456) * fix check inputs to allow prompt embeds in instruct pix2pix * linting * add reference comment to check inputs * remove comment * style changes --------- Co-authored-by: Will Berman <wlbberman@gmail.com>