Fix debugwalk when there's nothing to walk.
#header#
<title>#repo|escape#: changeset #node|short#</title>
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<body>
<div class="buttons">
<a href="?cmd=changelog;rev=#rev#">changelog</a>
<a href="?cmd=tags">tags</a>
<a href="?cmd=manifest;manifest=#manifest#;path=/">manifest</a>
<a href="?cmd=changeset;node=#node#;style=raw">raw</a>
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<h2>changeset: #desc|escape|firstline#</h2>
<table id="changesetEntry">
<tr>
<th class="changeset">changeset #rev#:</th>
<td class="changeset"><a href="?cmd=changeset;node=#node#">#node|short#</a></td>
</tr>
#parent#
#changesettag#
<tr>
<th class="manifest">manifest:</th>
<td class="manifest"><a href="?cmd=manifest;manifest=#manifest#;path=/">#manifest|short#</a></td>
</tr>
<tr>
<th class="author">author:</th>
<td class="author">#author|obfuscate#</td>
</tr>
<tr>
<th class="date">date:</th>
<td class="date">#date|date# (#date|age# ago)</td></tr>
<tr>
<th class="files">files:</th>
<td class="files">#files#</td></tr>
<tr>
<th class="description">description:</th>
<td class="description">#desc|escape|addbreaks#</td>
</tr>
</table>
<div id="changesetDiff">
#diff#
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