anchor.diff:      boolean cancel = request.getParameter("cancel") != null;
       String users = ParamUtils.getParameter(request, "users");
       String [] adminIDs = ParamUtils.getParameters(request, "admin");
  -    String [] oldAdminIDs = ParamUtils.getParameters(request, "oldAdmin");
       String [] deleteMembers = ParamUtils.getParameters(request, "delete");
       String groupName = ParamUtils.getParameter(request, "group");
       GroupManager groupManager = webManager.getGroupManager();
  
positive.code: 
  
  <%!
      private static String toList(String[] array) {
          if (array == null || array.length == 0) {
              return "";
          }
          StringBuffer buf = new StringBuffer();
          String sep = "";
          for (int i=0; i<array.length; i++) {
              buf.append(sep).append(array[i]);
              sep = ",";
          }
          return buf.toString();
  
negative.code:                     if (groupDisplayName != null) {
                          group.getProperties().put("sharedRoster.displayName", groupDisplayName);
                      }
                      group.getProperties().put("sharedRoster.groupList", toList(groupNames, "UTF-8"));
                  }
                  else {
                      group.getProperties().put("sharedRoster.showInRoster", "nobody");
  