misc: Fix operator output with gflopss=None #7191

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	50m 31s
pytest-ubuntu-py311-gcc11-noomp-adjoint	38m 55s
pytest-ubuntu-py312-gcc12-omp-base	1h 8m 12s
pytest-ubuntu-py312-gcc12-omp-adjoint	51m 32s
pytest-ubuntu-py39-gcc7-omp-base	52m 53s
pytest-ubuntu-py39-gcc7-omp-adjoint	40m 29s
pytest-ubuntu-py310-gcc10-noomp-base	50m 41s
pytest-ubuntu-py310-gcc10-noomp-adjoint	39m 59s
pytest-ubuntu-py312-gcc13-omp-base	1h 8m 33s
pytest-ubuntu-py312-gcc13-omp-adjoint	52m 44s
pytest-ubuntu-py39-gcc9-omp-base	53m 30s
pytest-ubuntu-py39-gcc9-omp-adjoint	39m 48s
pytest-osx-py312-clang-omp-base	33m 21s
pytest-docker-py39-gcc-omp-base	46m 13s
pytest-docker-py39-gcc-omp-adjoint	35m 23s
pytest-docker-py39-icx-omp-base	38m 21s
pytest-docker-py39-icx-omp-adjoint	35m 23s
	13h 16m 28s

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