Issue 135: fix ndim value #392

Job	Run time
python3_tests (debian12, extrasettings)	1s
python2_tests (debian10, extrasettings)	1m 55s
python3_tests (debian12, extraserver)	1s
flake8_tests	13s
python2_tests (debian10, extraserver)	1m 55s
python3_tests (debian12, basicserver)	1s
python2_tests (debian10, basicserver)	1m 56s
python3_tests (debian12, basicsettings)	1s
python2_tests (debian10, basicsettings)	1m 56s
python3_tests (debian12, basic)	1s
python2_tests (debian10, basic)	1m 54s
python3_tests (debian11, extrasettings)	1s
python3_tests (debian11, extraserver)	1s
python3_tests (debian11, basicserver)	1s
python3_tests (debian11, basicsettings)	1s
python3_tests (debian11, basic)	1s
python3_tests (debian10, extrasettings)	1s
python3_tests (debian10, extraserver)	1s
python3_tests (debian10, basicserver)	1m 56s
python3_tests (debian10, basicsettings)	1m 31s
python3_tests (debian10, basic)	1m 56s
python3_tests (ubuntu22.04, extrasettings)	1s
python3_tests (ubuntu22.04, extraserver)	1s
python3_tests (ubuntu22.04, basicserver)	1s
python3_tests (ubuntu22.04, basicsettings)	1s
python3_tests (ubuntu22.04, basic)	1s
python3_tests (ubuntu24.04, extrasettings)	1s
python3_tests (ubuntu24.04, extraserver)	1s
python3_tests (ubuntu24.04, basicserver)	1s
python3_tests (ubuntu24.04, basicsettings)	1s
python3_tests (ubuntu24.04, basic)	1s
	15m 34s

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