Fix subscribe button display

Signed-off-by: Matt Friedman <maf675@gmail.com>

Author: iMattPro

styles/all/template/event/notification_dropdown_footer_after.html

@@ -1,4 +1,4 @@
-{% if NOTIFICATIONS_WEBPUSH_ENABLE and not notification_types|default and not notification_list|default %}
+{% if NOTIFICATIONS_WEBPUSH_ENABLE and notification_types is not defined and notification_list is not defined %}
 	<div class="wpn-notification-dropdown-footer" title="{{ lang('NOTIFY_WEBPUSH_DROPDOWN_TITLE') }}">
 		<span class="ellipsis-text">{{ lang('NOTIFY_WEBPUSH_ENABLE_SHORT') ~ lang('COLON') }}</span>
 		<button id="subscribe_webpush" name="subscribe_webpush"><i class="icon fa-toggle-off fa-fw icon-lightgray"></i><span>{{ lang('NOTIFY_WEBPUSH_SUBSCRIBE') }}</span></button>

styles/prosilver/template/event/ucp_notifications_content_before.html

@@ -1,4 +1,4 @@
-{% if NOTIFICATIONS_WEBPUSH_ENABLE %}
+{% if NOTIFICATIONS_WEBPUSH_ENABLE and notification_types is defined %}
 	<div class="panel">
 		<div class="inner">
 			<fieldset>