Commit d7640706 authored by Tong Shen's avatar Tong Shen Committed by TensorFlower Gardener
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Fix FunctionalizeCond crash when fed with invalid control flow graph. 

In some cases, we might get invalid control flow graph where Merge node inputs are not in any CondContext. As a result, in JoinCondStatesMerge(), the CondId 'src' will be nullptr. Check this case and return an error.

PiperOrigin-RevId: 231839691
parent 31723c74
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