Improve error message for failure when opening CSV #1668

Job	Run time
test_bmi_c (ubuntu-latest)	3m 53s
test_bmi_cpp (ubuntu-latest)	3m 15s
test_bmi_fortran (ubuntu-latest)	3m 15s
test_bmi_c (macos-latest)	6m 22s
test_bmi_cpp (macos-latest)	5m 19s
test_bmi_fortran (macos-latest)	1m 35s
test_bmi_multi (ubuntu-latest)	3m 58s
test_bmi_python (ubuntu-latest)	3m 44s
test_mpi_remote_nexus (ubuntu-latest)	1m 26s
test_bmi_multi (macos-latest)	8m 24s
test_bmi_python (macos-latest)	7m 34s
test_pet (ubuntu-latest)	2m 57s
test_pet (macos-latest)	5m 52s
test_unit (ubuntu-latest)	5m 12s
test_unit (macos-latest)	9m 33s
	1h 12m 19s

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