[Datasets] Allow for Parquet metadata file to be missing. (#17217)
[Datasets] Allow for Parquet metadata file to be missing. (#17217)

* Allow for Parquet metadata file to be missing.

* Remove for-else.
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray