Update connector_base_impl.h #362

Job	Run time
clang-format	19s
lychee_IGNORED	24s
forbidden_types	15s
cppcheck	4m 2s
copyright_headers	21s
rstcheck	20s
unused_names	15s
vale	37s
black	32s
flake8	23s
isort	11s
mypy	37s
pydocstyle	27s
pylint	39s
sphinx-rtd	3m 15s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	2m 32s
build_linux (ubuntu-20.04, gcc, boost, optimize, warning)	4m 8s
build_linux (ubuntu-20.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	4m 30s
build_linux (ubuntu-20.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	4m 16s
build_linux (ubuntu-20.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	6h 0m 19s
	6h 28m 22s

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