API: Fix Sparse rebuild with explicit empty subfunctions #7103

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	50m 48s
pytest-ubuntu-py311-gcc11-noomp-adjoint	39m 3s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 23s
pytest-ubuntu-py312-gcc12-omp-adjoint	50m 24s
pytest-ubuntu-py39-gcc7-omp-base	52m 18s
pytest-ubuntu-py39-gcc7-omp-adjoint	40m 28s
pytest-ubuntu-py310-gcc10-noomp-base	51m 28s
pytest-ubuntu-py310-gcc10-noomp-adjoint	41m 4s
pytest-ubuntu-py312-gcc13-omp-base	1h 7m 37s
pytest-ubuntu-py312-gcc13-omp-adjoint	50m 25s
pytest-ubuntu-py39-gcc9-omp-base	53m 35s
pytest-ubuntu-py39-gcc9-omp-adjoint	40m 26s
pytest-osx-py312-clang-omp-base	33m 17s
pytest-docker-py39-gcc-omp-base	47m 11s
pytest-docker-py39-gcc-omp-adjoint	36m 0s
pytest-docker-py39-icx-omp-base	38m 24s
pytest-docker-py39-icx-omp-adjoint	35m 1s
	13h 14m 52s

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