fix: SegFault when a MPI rank has no data of a sub-region #9986

Job	Run time
semantic_pull_request	4s
is_not_draft_pull_request	3s
are_submodules_in_sync	10s
baseline_log	3s
if_not_unassigned_pull_request	1s
code_coverage / build_test_deploy	6s
Sherlock CPU (centos 7.9.2009, gcc 10.1.0, open-mpi 4.1.2, openblas 0.3.10) / build_test_deploy	1h 28m 0s
Ubuntu (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	1h 13m 13s
Ubuntu (20.04, gcc 9.4.0, open-mpi 4.0.3) / build_test_deploy	1h 21m 17s
Ubuntu (22.04, clang 15.0.7, open-mpi 4.1.2) / build_test_deploy	1h 9m 12s
Ubuntu (22.04, gcc 11.4.0, open-mpi 4.1.2) / build_test_deploy	1h 13m 2s
Check code style / build_test_deploy	1m 31s
Check documentation / build_test_deploy	1m 15s
Ubuntu (22.04, gcc 12.3.0, open-mpi 4.1.2) / build_test_deploy	1h 25m 30s
Ubuntu debug (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	56m 35s
Pangea 3 CUDA (AlmaLinux 8.8, gcc 9.4.0, open-mpi 4.1.2, cuda 11.5.0, openblas 0.3.10) / build_test_deploy	7s
Rockylinux CUDA (8, clang 17.0.6, cuda 12.5.1) / build_test_deploy	6s
Rockylinux CUDA (8, gcc 8.5, cuda 12.5.1) / build_test_deploy	6s
Sherlock GPU (centos 7.9.2009, gcc 10.1.0, open-mpi 4.1.2, openblas 0.3.10, cuda 12.4.0,) / build_test_deploy	6s
Ubuntu CUDA debug (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	6s
Ubuntu CUDA (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	5s
run_integrated_tests / build_test_deploy	36m 36s
check_that_all_jobs_succeeded	1s
	9h 27m 15s

Provide feedback