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.
{header}
<!-- Error -->
<id>{urlbase}{url|urlescape}</id>
<link rel="self" href="{urlbase}{url|urlescape}atom-log"/>
<link rel="alternate" href="{urlbase}{url|urlescape}"/>
<title>Error</title>
<updated>1970-01-01T00:00:00+00:00</updated>
<entry>
<title>Error</title>
<id>http://mercurial.selenic.com/#error</id>
<author>
<name>mercurial</name>
</author>
<updated>1970-01-01T00:00:00+00:00</updated>
<content type="text">{error|escape}</content>
</entry>
</feed>