templates/tagentry-rss.tmpl

hgweb: fix errors and warnings found by pychecker

- fix missing import
- use type_ instead of type
- remove unused variable

<item>
    <title>#tag|escape#</title>
    <link>#url#?cs=#node|short#</link>
    <description><![CDATA[#tag|strip|escape|addbreaks#]]></description>
    <pubDate>#date|rfc822date#</pubDate>
</item>