fixed issue 1818, error in wiki/renderer, thanks Alan

gluon/tools.py

@@ -5523,7 +5523,7 @@ class Wiki(object):
                 url = URL(args=('_edit', slug))
                 return dict(content=A('Create page "%s"' % slug, _href=url, _class="btn"))
             else:
-                html = page.html if not force_render else self.get_renderer(page)
+                html = page.html if not force_render else self.get_renderer()(page)
                 content = XML(self.fix_hostname(html))
                 return dict(title=page.title,
                             slug=page.slug,