Switch to the sigmaexporter-plugin branch (https://github.com/oxfordinternetinstitute/gephi-plugins/tree/sigmaexporter-plugin/modules/sigmaExporter) or jsonexporter-plugin branch (https://github.com/oxfordinternetinstitute/gephi-plugins/tree/jsonexporter-plugin/modules/JsonExporter) for the relevant code.
Clicking the "more information" link when nothing has been set show an empty dialog
Side-note: I've extracted the plain sources of network.zip so the diff is easier to show, you can keep or not the commit