Fix compatibility with PHP 5.4

skins/elastic/templates/includes/settings-menu.html

@@ -1,4 +1,4 @@
-<div class="sidebar listbox<roundcube:exp expression="empty(request:_action) ? ' selected' : ''"/>" role="navigation" aria-labelledby="aria-label-settingstabs">
+<div class="sidebar listbox<roundcube:exp expression="!request:_action ? ' selected' : ''"/>" role="navigation" aria-labelledby="aria-label-settingstabs">
 	<div class="header">
 		<a class="button icon menu-button" href="#menu"><span class="inner"><roundcube:label name="menu" /></span></a>
 		<span id="aria-label-settingstabs" class="header-title"><roundcube:label name="settings" /></span>

skins/elastic/templates/settings.html

@@ -4,7 +4,7 @@
 
 <h1 class="voice"><roundcube:label name="settings" /> : <roundcube:label name="preferences" /></h1>
 
-<div class="list listbox<roundcube:exp expression="empty(request:_action) ? '' : ' selected'"/>" aria-labelledby="aria-label-prefsection">
+<div class="list listbox<roundcube:exp expression="!request:_action ? '' : ' selected'"/>" aria-labelledby="aria-label-prefsection">
 	<div class="header">
 		<a class="button icon menu-button" href="#menu"><span class="inner"><roundcube:label name="menu" /></span></a>
 		<a class="button icon back-sidebar-button" href="#sidebar"><span class="inner"><roundcube:label name="settings" /></span></a>