DRAFT: Try to fix MPI error from particle buffer refactoring

[alexrlongne]

• Call resize portion even if no particles in buffer (like old behavior)

PR Summary

PR Checklist

• Code passes cpplint
• New features are documented.
• Adds a test for any bugs fixed. Adds tests for new features.
• Code is formatted
• Changes are summarized in CHANGELOG.md
• Change is breaking (API, behavior, ...)
  • Change is additionally added to CHANGELOG.md in the breaking section
  • PR is marked as breaking
  • Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• CI has been triggered on Darwin for performance regression tests.
• Docs build
• (@lanl.gov employees) Update copyright on changed files

[alexrlongne]

Just wanted try the CI through AMD as I don't know how to do that by hand yet.

[brryan]

@alexrlongne did you try running e.g. mpiexec -n 2 /.../build/example/particle_leapfrog/particle-leapfrog -i /.../parthenon/tst/regression/test_suites/particle_leapfrog/parthinput.particle_leapfrog parthenon/job/problem_id=gold --kokkos-map-device-id-by=mpi_rank on darwin? I guess I'm asking whether this error only shows up on amd machines, which would be surprising to me,

[alexrlongne]

Fixed in #1206