fix: replace bare except with except Exception in pytree init

[harshadkhetpal]

Summary

Replace bare except: with except Exception: in extension/pytree/__init__.py.

Bare except: catches all exceptions including SystemExit, KeyboardInterrupt, and GeneratorExit, which should not be silently caught. Since this handler only logs and falls back to torch pytree on import failure, catching Exception is the correct scope.

Change:

# Before
except:
    logger.info(...)

# After
except Exception:
    logger.info(...)

Testing

No behavior change — the import fallback logic is preserved.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18744

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures, 2 Unrelated Failures

As of commit 8c1f79c with merge base b9a6b84 ():

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / cpu-test / test-aot / test-aot (gh)
  backends/cadence/aot/tests/test_replace_ops_passes.py::TestReplaceOpsPasses::test_replace_transposed_conv_with_linear_3
• Cadence Build & Test / cpu-test / test-ops / test-ops (gh)
  examples/cadence/operators/test_requantize_op.py::CadenceRequantizeOpCases::test_cadence_requantize_out_06
• Lint / lintrunner-mypy (gh)
  >>> Lint for backends/arm/test/models/stable_diffusion/stable_diffusion_module_test_configs.py:
• pull / test-openvino-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 0c30eab65e506e0a7002e41b3e0d91b9e87a67d8506d875c219a336627b5f904 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[nil-is-all]

Hi @harshadkhetpal, please sign the CLA and clear the failing checks (also in #18484)