Population description field instead of populating networkGrp

[cliffordsnow]

When Disconnected Island is run on a geojson linestring, it creates a description field and populates it with an integer. It also creates a networkGrp field populated with null values.

The work around is to edit the attribute table deleting the networkGrp field then save the change. The work around renames the description field to networkGrp.

This happens on both Fedora Linux, F29 and Mac OSX.
QGIS version 3.62.
Disconnected island version 2.0.1