_civicrm_api3_get_DAO() called on entities not present in CRM/Core/DAO/.listAll.php

In 4.1beta3 using the api as follows:

$params = array(
'name' => 'ufGroup',
'version' => '3',
);
$result = civicrm_api('constant','get',$params);

throws PHP Notices: Undefined index: Constant in _civicrm_api3_get_DAO() (line 255 of /Users/shawn/Sites/civirelate/sites/all/modules/civicrm/api/v3/utils.php)

because each of the following functions execute a getfields action through the api:
_civicrm_api3_swap_out_aliases
_civicrm_api3_getdefaults
_civicrm_api3_getrequired

and _civicrm_api_get_fields uses _civicrm_api3_get_DAO to build a $dao variable.

Should we check that the array key exists in _civicrm_api3_get_DAO before using it?