Arvados

There appears to be a bug in our filter code on the API side, where a call like this:

arv group list --filters='[["group_class", "!=", "project"]]'

does not return any groups where group_class is set to null. Of course group_class should probably not be set to null, but that is irrelevant; the filter should not exclude those records from this call.

The workbench code uses a functionally identical API call to show the list of groups on the sharing screen.