Pull request #793 broke negative prompts for IMG2IMG pipeline

[OrionFive]

Describe the bug

The commit #793 broke negative prompts. By changing the type of prompt before changing the type of negPrompt, but comparing their types in between, it is now impossible to use single negative prompts.

Would be great if you could resolve this, @patrickvonplaten.

Reproduction

Use a single str negative prompt with the img2img pipeline.

Logs

/content/diffusers/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_img2img.py in __call__(self, prompt, init_image, strength, num_inference_steps, guidance_scale, negative_prompt, num_images_per_prompt, eta, generator, output_type, return_dict, callback, callback_steps, **kwargs)
    251             elif type(prompt) is not type(negative_prompt):
    252                 raise TypeError(
--> 253                     "`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
    254                     " {type(prompt)}."
    255                 )

TypeError: `negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} != {type(prompt)}.

System Info

Latest version from GitHub main branch.

[OrionFive]

Note that this can be worked around by wrapping prompt and negative prompt in [ ] when passing it to the pipeline.

[patrickvonplaten]

Thanks a lot for you note here @OrionFive ❤️

[patrickvonplaten]

Looking into it (hope to be able to do so in 2h :-))

[anton-l]

Fix incoming: #823

[patrickvonplaten]

Thanks for the fast fix @anton-l