Fix error when dtype in config is unset

[hans00]

No description provided.

[xenova]

Thanks for the PR! 👍 Is there an example of a model you faced this issue with? Ideally, the dtype should be either:

• a string (e.g., fp16), or
• an object mapping module to dtype (e.g., { encoder_model: 'fp16'}

[hans00]

Some model config have not setted dtype.
If specific dtype: auto on init, will got error.

[xenova]

Thanks! LGTM

[HuggingFaceDocBuilderDev]

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