revlog: adapt the `reading` check for `unionrepo`
We cannot just rely on the length check for the `unionrepo` as the local revlog
might be empty while the other revlog contains data. In addition, we need to
also open the second revlog for reading when needed.
{header}
<title>{repo|escape}: Branches</title>
<link rel="alternate" type="application/atom+xml"
href="{url|urlescape}atom-branches" title="Atom feed for {repo|escape}: branches"/>
<link rel="alternate" type="application/rss+xml"
href="{url|urlescape}rss-branches" title="RSS feed for {repo|escape}: branches"/>
</head>
<body>
<div class="page_header">
<a href="{logourl}" title="Mercurial" style="float: right;">Mercurial</a>
<a href="/">Mercurial</a> {pathdef%breadcrumb} / branches
</div>
<div class="page_nav">
<div>
<a href="{url|urlescape}summary{sessionvars%urlparameter}">summary</a> |
<a href="{url|urlescape}shortlog{sessionvars%urlparameter}">shortlog</a> |
<a href="{url|urlescape}log{sessionvars%urlparameter}">changelog</a> |
<a href="{url|urlescape}graph{sessionvars%urlparameter}">graph</a> |
<a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a> |
<a href="{url|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a> |
branches |
<a href="{url|urlescape}file{sessionvars%urlparameter}">files</a> |
<a href="{url|urlescape}help{sessionvars%urlparameter}">help</a>
</div>
{searchform}
</div>
<div class="title"> </div>
<table cellspacing="0">
{entries%branchentry}
</table>
{footer}