compiler: Avoid empty Clusters #9139

Job	Run time
pytest-ubuntu-py310-gcc14-omp-base	40m 28s
pytest-ubuntu-py312-gcc12-cxxomp-base	49m 34s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	30m 53s
pytest-ubuntu-py310-gcc14-omp-adjoint	30m 49s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	43m 41s
pytest-ubuntu-py312-gcc13-omp-base	49m 57s
pytest-ubuntu-py310-gcc9-omp-base	39m 28s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	37m 16s
pytest-ubuntu-py310-gcc9-omp-adjoint	29m 58s
pytest-ubuntu-py311-gcc10-noomp-base	40m 49s
pytest-docker-py310-icx-omp-base	31m 21s
pytest-ubuntu-py311-gcc10-noomp-adjoint	25m 53s
pytest-docker-py310-gcc-omp-base	36m 1s
pytest-ubuntu-py312-gcc13-omp-adjoint	30m 56s
pytest-osx-py312-clang-omp-base	38m 50s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 12s
pytest-ubuntu-py313-gcc14-omp-adjoint	32m 52s
pytest-docker-py310-gcc-omp-arm64-base	29m 50s
pytest-ubuntu-py313-gcc14-omp-base	46m 15s
pytest-docker-py310-icx-omp-adjoint	26m 14s
pytest-docker-py310-gcc-omp-adjoint	27m 0s
	12h 20m 17s

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