Some test data has values of "NA" in contact maps. This commit allows us to handle them by inserting them as NULL into the SQLite database and reporting them as null in the JSON output from the server, which the contact map widget already knows how to handle.
Some test data has values of "NA" in contact maps. This commit allows us to handle them by inserting them as NULL into the SQLite database and reporting them as null in the JSON output from the server, which the contact map widget already knows how to handle.