Fix a bug in Orbax checkpointing where None values PyTree are not handled correctly. This is caused by a recent update in jax where None values are no longer considered as a leaf node: https://jax.readthedocs.io/en/latest/changelog.html#jax-0-4-34-october-4-2024.

[copybara-service[bot]]

Fix a bug in Orbax checkpointing where None values PyTree are not handled correctly. This is caused by a recent update in jax where None values are no longer considered as a leaf node: https://jax.readthedocs.io/en/latest/changelog.html#jax-0-4-34-october-4-2024.

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