Fix crash with async tree deletions if the executor has not yet initialized.

By the time afterCommand runs, we don't know if executorInit has run so we
cannot make any assertions about the state modified by the latter.  The code
contained one such assertion that relied on the asynchronous tree deleter
being initialized, which caused a crash in some circumstances.

While doing this, add a test to validate this in the general case for the
sandbox module given that this is not the first time we spot a similar issue
in it.

Follow up to https://github.com/bazelbuild/bazel/issues/7527.

RELNOTES: None.
PiperOrigin-RevId: 268512558
2 files changed
tree: be0ad79395a2246b26bae33235a1488f02acf7d9
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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