misc: Fix operator output with gflopss=None #7193

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	51m 2s
pytest-ubuntu-py311-gcc11-noomp-adjoint	38m 29s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 45s
pytest-ubuntu-py312-gcc12-omp-adjoint	50m 19s
pytest-ubuntu-py39-gcc7-omp-base	54m 38s
pytest-ubuntu-py39-gcc7-omp-adjoint	41m 15s
pytest-ubuntu-py310-gcc10-noomp-base	51m 33s
pytest-ubuntu-py310-gcc10-noomp-adjoint	39m 15s
pytest-ubuntu-py312-gcc13-omp-base	1h 7m 21s
pytest-ubuntu-py312-gcc13-omp-adjoint	51m 34s
pytest-ubuntu-py39-gcc9-omp-base	53m 32s
pytest-ubuntu-py39-gcc9-omp-adjoint	40m 45s
pytest-osx-py312-clang-omp-base	32m 43s
pytest-docker-py39-gcc-omp-base	46m 9s
pytest-docker-py39-gcc-omp-adjoint	35m 42s
pytest-docker-py39-icx-omp-base	38m 5s
pytest-docker-py39-icx-omp-adjoint	35m 38s
	13h 15m 45s

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