[BugFix] Fix collector with no buffers and devices

[vmoens]

Stack from ghstack (oldest at bottom):

• -> [BugFix] Fix collector with no buffers and devices #2809

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2809

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 2 Unrelated Failures

As of commit 720f8fb with merge base 3acf491 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Habitat Tests on Linux / tests (3.9, 12.4) / linux-job (gh)
  RuntimeError: Command docker exec -t 5e1322d76aba8caad75268344560d9785da25ec2197ac21840e597393a03de45 /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

• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh) (trunk failure)
  test/test_transforms.py::TestConditionalSkip::test_trans_parallel_env_check[True-False]
• Unit-tests on Windows / unittests-cpu (3.10, windows.4xlarge, cpu) / windows-job (gh) (trunk failure)
  test/test_transforms.py::TestTimer::test_transform_env

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