fix incorrect warning when walking on a particular rev
when a directory was given instead of a file it reported
incorrectly 'No such file or directory in rev <rev>'
we test if the file is a prefix directory
#header#
<div class="page_nav">
<a href="?cmd=summary;style=gitweb">summary</a> | <a href="?cmd=shortlog;style=gitweb">shortlog</a> | <a href="?cmd=changelog;style=gitweb">changelog</a> | <a href="?cmd=tags;style=gitweb">tags</a> | <a href="?cmd=manifest;manifest=#manifest#;path=/;style=gitweb">manifest</a><br/>
</div>
<h2>searching for #query|escape#</h2>
<form>
search:
<input type="hidden" name="cmd" value="changelog">
<input type="hidden" name="style" value="gitweb">
<input name="rev" type="text" width="30" value="#query|escape#">
</form>
#entries#
<form>
search:
<input type="hidden" name="cmd" value="changelog">
<input type="hidden" name="style" value="gitweb">
<input name="rev" type="text" width="30">
</form>
#footer#