title: Mage::getModel('index/process') returns false
body: <p>I call <code>Mage::getModel('index/process')</code> in data-upgrade script and it returns <code>false</code>. If i call <code>Mage::getModel('Mage_Index_Model_Process')</code> it returns object but then when i call <code>getCollection()</code> on this object this function returns <code>false</code>.
  What i'm doing wrong?</p>