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[onnx] Do not deref nullptr in scalar type analysis (pytorch#50237)
Summary: Apply a little bit of defensive programming: `type->cast<TensorType>()` returns an optional pointer so dereferencing it can lead to a hard crash. Fixes SIGSEGV reported in pytorch#49959 Pull Request resolved: pytorch#50237 Reviewed By: walterddr Differential Revision: D25839675 Pulled By: malfet fbshipit-source-id: 403d6df5e2392dd6adc308b1de48057f2f9d77ab
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