Sqlite null fix #1641

Job	Run time
test_bmi_c (ubuntu-latest)	3m 57s
test_bmi_cpp (ubuntu-latest)	4m 33s
test_bmi_cpp (macos-latest)	5m 24s
test_mpi_remote_nexus (ubuntu-latest)	3m 16s
test_bmi_c (macos-latest)	5m 16s
test_pet (ubuntu-latest)	3m 37s
test_pet (macos-latest)	3m 24s
test_unit (ubuntu-latest)	7m 15s
test_unit (macos-latest)	9m 18s
test_bmi_fortran (ubuntu-latest)	3m 37s
test_bmi_fortran (macos-latest)	7m 14s
test_bmi_multi (ubuntu-latest)	4m 13s
test_bmi_multi (macos-latest)	6m 17s
test_bmi_python (ubuntu-latest)	3m 51s
test_bmi_python (macos-latest)	8m 47s
	1h 19m 59s

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