refactor: remove the code that covers the no output segmented block

[bowang007]

Signed-off-by: Bo Wang [email protected]

Description

Before this feature https://github.com/pytorch/TensorRT/issues/1031 is supported, there might be some cases that TensorRT segmented block has NonTensor input, so we go through the nodes' output one by one to determine the output for this block if there is no output for this block. However, this this PR merged https://github.com/pytorch/TensorRT/pull/1140, we can ensure that every TensorRT segmented block has Tensor input, which means there will never be no output for segmented block.

Therefore, we can erase these lines.

support #1121

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