dirstate: deal with read-race for pure python code
If we cannot read the dirstate data, this is probably because a writing process
wrote it under our feet. So refresh the docket and try again a handful of time.
<li class="parity{parity}" data-node="{node|short}">
<div class="fg">
<span class="desc">
<a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a>
</span>
<div class="info"><span class="age">{date|rfc822date}</span>, by {author|person}</div>
</div>
</li>