Dear friend it is very simple to hide No or NA , from attribute field,just follow the below path: app/design/frontend/default/[Your Theme]/template/catalog/product/view/attributes.phtml
And add below code :
<?php foreach ($_additional as $_data):
// Add these 2 lines
$_test_data_value = trim($_data['value']);
if ((empty($_test_data_value) || in_array($_test_data_value, array(Mage::helper('catalog')->__('N/A'), Mage::helper('catalog')->__('No'))))) continue;?>
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