docs: public static List<String> getCallbackUserRoles(UserGroupCallback userGroupCallback, String userId) {
  		List<String> roles = userGroupCallback != null ? userGroupCallback.getGroupsForUser(userId) : new ArrayList<>();
  		if (roles == null || roles.isEmpty()) {
  			roles = new ArrayList<>();
  			roles.add("");
  		}
  
  		return roles;
  	}