misc: Fix operator output with OI=None #7189

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	52m 43s
pytest-ubuntu-py311-gcc11-noomp-adjoint	39m 9s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 48s
pytest-ubuntu-py312-gcc12-omp-adjoint	50m 54s
pytest-ubuntu-py39-gcc7-omp-base	54m 10s
pytest-ubuntu-py39-gcc7-omp-adjoint	40m 46s
pytest-ubuntu-py310-gcc10-noomp-base	51m 30s
pytest-ubuntu-py310-gcc10-noomp-adjoint	40m 8s
pytest-ubuntu-py312-gcc13-omp-base	1h 7m 28s
pytest-ubuntu-py312-gcc13-omp-adjoint	50m 53s
pytest-ubuntu-py39-gcc9-omp-base	53m 43s
pytest-ubuntu-py39-gcc9-omp-adjoint	41m 20s
pytest-osx-py312-clang-omp-base	37m 53s
pytest-docker-py39-gcc-omp-base	46m 38s
pytest-docker-py39-gcc-omp-adjoint	35m 27s
pytest-docker-py39-icx-omp-base	45m 16s
pytest-docker-py39-icx-omp-adjoint	44m 36s
	13h 40m 22s

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