Ensure we track fused batchnorm layer's trainable variables when the batch is empty to avoid an edge case with distributed training.
Ensure we track fused batchnorm layer's trainable variables when the batch is empty to avoid an edge case with distributed training.

PiperOrigin-RevId: 421871833
Change-Id: Ie3a01778cd7254f8da09756754a2c747c3a755d8

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