How can I hide element if mail alert field is active?

[Dove99x]

How do I hide element if mail alert is showing in the product page? Using "{if $HOOK_PRODUCT_OOS}" in the products page doesn't seem to be working as it removes the element whether its there or not. 

 

Location: mailalerts/views/templates/hook/product.tpl

<!-- MODULE MailAlerts --> 

{if isset($email) AND $email} 
<input type="text" id="oos_customer_email" name="customer_email" size="20" value="{l s='[email protected]' mod='mailalerts'}" 
class="mailalerts_oos_email" onclick="clearText();" /><br /> 
{/if}
 
<a href="#" title="{l s='Notify me when available' mod='mailalerts'}" onclick="return addNotification();" 
id="mailalert_link" rel="nofollow">{l s='Notify me when available' mod='mailalerts'}</a> <span id="oos_customer_email_result" 
style="display:none;"></span> 

<!-- END : MODULE MailAlerts -->

Edited June 14, 2017 by Dove99x (see edit history)