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[BUG] HF_ENDPOINT not correctly handled in get_hf_file_metadata

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### Describe the bug ### Describe the bug When testing [NanoVLM](https://github.com/huggingface/nanoVLM), I noticed that when xet_file_data is None, `HF_ENDPOINT` works correctly (e.g., for datasets). However, for some models, the metadata...

fix for #3168