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75aab346 - Allow users to save SDXL LoRA weights for only one text encoder (#7607)

Allow users to save SDXL LoRA weights for only one text encoder (#7607) SDXL LoRA weights for text encoders should be decoupled on save The method checks if at least one of unet, text_encoder and text_encoder_2 lora weights are passed, which was not reflected in the implentation. Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> Co-authored-by: YiYi Xu <yixu310@gmail.com>