dispatch: only do __import__(debugger) when a debugger is requested
When having ui.debugger=somedebugger in one's ~/.hgrc, this then
somedebugger would be imported for every hg command. With this patch,
this import only happens if the --debugger parameter is passed.
<entry>
<title>{desc|strip|firstline|strip|escape|nonempty}</title>
<id>{urlbase}{url|urlescape}#changeset-{node}</id>
<link href="{urlbase}{url|urlescape}rev/{node|short}"/>
<author>
<name>{author|person|escape}</name>
<email>{author|email|obfuscate}</email>
</author>
<updated>{date|rfc3339date}</updated>
<published>{date|rfc3339date}</published>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<pre xml:space="preserve">{desc|escape|nonempty}</pre>
</div>
</content>
</entry>