Hide empty attributes in Magento

On a product page Magento will show some attributes on the front-end as “No” or “N/A” when that attribute is empty, not very useful for the majority of store owners who may not have their attribute sets tightly defined. To fix this you can move the attributes.phtml file into your theme and edit the foreach loop as below;

<?php foreach ($_additional as $_data): ?>
    <?php $_attribute = $_product->getResource()->getAttribute($_data['code']);?>
    <?php if (!is_null($_product->getData($_attribute->getAttributeCode())) && ((string)$_attribute->getFrontend()->getValue($_product) != '')): ?>
        <tr>
        <th class="label"><?php echo $this->htmlEscape($this->__($_data['label'])) ?></th>
        <td class="data"><?php echo $_helper->productAttribute($_product, $_data['value'], $_data['code']) ?></td>
        </tr>
    <?php endif;?>
<?php endforeach; ?>

The file should be located at app/design/frontend/default/[Your Theme]/template/catalog/product/view/attributes.phtml