fix check_inputs to handle when prompts are empty but embeddings are …

[nimish007]

…passed

ideally check_inputs should not throw an error if both prompt and prompt embeds are passed as they can be later concatenated. leaving that as is for now to ensure simplicity in line 609.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[patrickvonplaten]

Thanks a lot for the PR @nimish007 !

Could you run:

make style

once to make sure the code quality tests are passing? :-)

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