private void remove(String world,PermissionHolder holder,String permission){
  try {
    if (world != null && !world.equals("")) {
      holder.unsetPermission(permission,server,world);
    }
 else {
      holder.unsetPermission(permission,server);
    }
  }
 catch (  ObjectLacksException ignored) {
  }
  save(holder);
}

private void remove ( String world , PermissionHolder holder , String permission ) { try { if ( world != null && ! world . equals ( "" ) ) { holder . unsetPermission ( permission , server , world ) ; } else { holder . unsetPermission ( permission , server ) ; } } catch ( ObjectLacksException ignored ) { } save ( holder ) ; }
generic method to remove a permission from a holder
