windows: fix use of undefined exception (issue1707)
This fixes the implied reliance on pywin32 and the win32 module. This
also fixes a regression in ae275ad46bd0 that made Mercurial unusable
without pywin32.
{header}
<title>{repo|escape}: Error</title>
<link rel="alternate" type="application/atom+xml"
href="{url}atom-log" title="Atom feed for {repo|escape}"/>
<link rel="alternate" type="application/rss+xml"
href="{url}rss-log" title="RSS feed for {repo|escape}"/>
</head>
<body>
<div class="page_header">
<a href="http://mercurial.selenic.com/" title="Mercurial" style="float: right;">Mercurial</a><a href="{url}summary{sessionvars%urlparameter}">{repo|escape}</a> / error
</div>
<div class="page_nav">
<a href="{url}summary{sessionvars%urlparameter}">summary</a> | <a href="{url}shortlog{sessionvars%urlparameter}">shortlog</a> | <a href="{url}log{sessionvars%urlparameter}">changelog</a> | <a href="{url}tags{sessionvars%urlparameter}">tags</a> | <a href="{url}file/{node|short}{sessionvars%urlparameter}">files</a><br/>
</div>
<div class="page_body">
<br/>
<i>An error occurred while processing your request</i><br/>
<br/>
{error|escape}
</div>
{footer}