Fix single file loading errors(https://github.com/huggingface/diffusers/issues/8435)

[suzukimain]

What does this PR do?

Fixes #8435

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[DN6]

Hi @suzukimain sorry, I think I opened a similar PR: #8462 without seeing this. It essentially does the same thing, while adding a couple of warning messages.

Is it okay if I close this?

[suzukimain]

Hi @suzukimain sorry, I think I opened a similar PR: #8462 without seeing this. It essentially does the same thing, while adding a couple of warning messages.

Is it okay if I close this?

@DN6 It's okay, thank you for reaching out to me.