Commit 48abc110 authored by A. Unique TensorFlower's avatar A. Unique TensorFlower Committed by TensorFlower Gardener
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Make SummaryAtEndHook work even if there are no summaries in the graph. 

Besides just general resilience to general user code, another motivation is that it
still makes sense to use the hook when there are no summaries in the graph for the side effect of writing out the graph summary.

PiperOrigin-RevId: 210975165
parent feffc075
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