[GeoFence] Make sure we convert blank username to ANY filter

Description

GeoFence Services interpret blank usernames as possible existing users into the rules DB.

When trying to fetch blank usernames, GeoFence complains by throwing such exception

org.geoserver.geofence.services.exception.BadRequestServiceEx: Blank user name

In order to avoid this, we must be sure on the GeoServer integration that we actually convert blank strings coming from the request into void usernames.

Environment

None

Status

Assignee

Alessio Fabiani

Reporter

Alessio Fabiani

Triage

None

Fix versions

Affects versions

2.15.0
2.14-RC

Components

Priority

Medium
Configure