quick fix; nbc was breaking when finding 0 numeric columns in dataset
quick fix; nbc was breaking when finding 0 numeric columns in dataset

mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery