diff -r 2255950e1f76 -r 4fd1f1d7569b mercurial/help.py
--- a/mercurial/help.py	Wed Jun 06 21:17:33 2012 -0500
+++ b/mercurial/help.py	Thu Jun 07 15:54:40 2012 +0200
@@ -107,8 +107,11 @@
         for cmd, entry in getattr(mod, 'cmdtable', {}).iteritems():
             if kw in cmd or (len(entry) > 2 and lowercontains(entry[2])):
                 cmdname = cmd.split('|')[0].lstrip('^')
-                cmddoc=getattr(mod, '__doc__', '').splitlines()[0]
-                results['extensioncommands'].append((cmdname, _(cmddoc)))
+                if mod.__doc__:
+                    cmddoc = gettext(mod.__doc__).splitlines()[0]
+                else:
+                    cmddoc = _('(no help text available)')
+                results['extensioncommands'].append((cmdname, cmddoc))
     return results
 
 def loaddoc(topic):