improve LogSearchIndex error handling, add explicit close() method, and modify get_index to not keep the index open persistently
<%inherit file="layout.tmpl" />
<div id="title">Available Channels</div>
<ul>
% for channel in channel_list :
<li><a href="${urls.channel.build(req, channel=channel)}">${channel.title}</a></li>
% endfor
</ul>