How to hide empty fields on user accounts display?
One way to look at this use node.tpl for this node type and add a php check like the following:

 &lt;?php if(!empty($content['your_field_name'])): ?&gt;
    &lt;div class="field-label"&gt;&lt;strong&gt;&lt;?php echo t('Your Label'); ?&gt;&lt;/strong&gt;&lt;/div&gt;
    &lt;?php print render($content['Your field Name']); ?&gt;
 &lt;?php endif; ?&gt;