mercurial/templates/rss/error.tmpl

bundle2: add some distinction between mandatory and advisory part

Mandatory part cannot be ignored when unknown. We raise a simple KeyError
exception when this happen.

This is very early version of this logic, see inline comment for future
improvement lead.

{header}
    <title>Error</title>
    <description>Error</description>
    <item>
      <title>Error</title>
      <description>{error|escape}</description>
      <guid>http://mercurial.selenic.com/#error</guid>
    </item>
  </channel>
</rss>