API: Fix Sparse rebuild with explicit empty subfunctions #7099

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	24s
pytest-ubuntu-py311-gcc11-noomp-adjoint	24s
pytest-ubuntu-py312-gcc12-omp-base	24s
pytest-ubuntu-py312-gcc12-omp-adjoint	24s
pytest-ubuntu-py39-gcc7-omp-base	20s
pytest-ubuntu-py39-gcc7-omp-adjoint	15s
pytest-ubuntu-py310-gcc10-noomp-base	24s
pytest-ubuntu-py310-gcc10-noomp-adjoint	26s
pytest-ubuntu-py312-gcc13-omp-base	24s
pytest-ubuntu-py312-gcc13-omp-adjoint	24s
pytest-ubuntu-py39-gcc9-omp-base	24s
pytest-ubuntu-py39-gcc9-omp-adjoint	24s
pytest-osx-py312-clang-omp-base	28s
pytest-docker-py39-gcc-omp-base	26s
pytest-docker-py39-gcc-omp-adjoint	26s
pytest-docker-py39-icx-omp-base	25s
pytest-docker-py39-icx-omp-adjoint	25s
	6m 47s

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