Remove PP Grad Tail Check (#2538)
* Only communicate grad tail if it exists
Co-authored-by: Dashiell Stander <dash.stander@gmail.com>
* Revert previous patch and just always send the grad tail
* Formatting
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Co-authored-by: Dashiell Stander <dash.stander@gmail.com>
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>
