UC Attributes: request for supporting other attribute types

Please, consider adding the following single line to uc_attribute.module, line 1289, inside function _uc_attribute_alter_form():

$attr_type = ''; // <<<<<<
switch ($attribute->display) {
  ...
}

Apart from being good PHP practice to initialize variables in such cases, it also allows other modules to add new attribute types, without giving a warning later in line 1303 where this variables is used.