Add test when there are no segments

[pytorchbot]

Summary:
The deprecation warning should only appear when there are values inside the constant_buffer and nothing inside the constant_segment.

Even when there are no constants in the program, we expect to have one 'segment' storing the placeholder for non-constants.

Fix failing jobs caused by error logging from #12295
Test failures: https://hud.pytorch.org/pr/pytorch/executorch/12631#46239138027

Arm test is using a recently-generated PTE, however hitting the deprecation warning because the pte has no constants.

Differential Revision: D78568839

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12687

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❌ 2 New Failures, 2 Cancelled Jobs

As of commit 78e62aa with merge base de24489 ():

NEW FAILURES - The following jobs have failed:

• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t 1c1ae2a4edec39a5061ac9cfdca0a570edb75ee141d053fabae7eee46e56218b /exec failed with exit code 2
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t afb36c4ad01793a693dda2b6423f65090a976fb1f33d5d65a90b286cb785e5a1 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

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