Handle empty (size=0) tensor in Inspector

[pytorchbot]

Summary:
Empty tensors are not handled so they throw errors.
{F1484412951}

Differential Revision: D56027102

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3192

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❌ 1 New Failure

As of commit 42b7355 with merge base d3326a2 ():

NEW FAILURE - The following job has failed:

• pull / test-models-linux (cmake, llava_encoder, portable, linux.4xlarge, 90) / linux-job (gh)
  RuntimeError: Command docker exec -t a622e0818e41c4ceb81778e15f257813e49e91df49c0e1555b02b93359963a80 /exec failed with exit code 1

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