Index: branches/release-33/plugins/WidgetManager/lib/WidgetManager/Plugin.pm
===================================================================
--- branches/release-33/plugins/WidgetManager/lib/WidgetManager/Plugin.pm (revision 1713)
+++ branches/release-33/plugins/WidgetManager/lib/WidgetManager/Plugin.pm (revision 1734)
@@ -30,7 +30,7 @@
             or return $ctx->error(MT->translate(
                 "Can't find included template widget '[_1]'", $mid ));
-        my $out = $ctx->tag('include', { widget => $tmpl->name })
+        defined(my $out = $ctx->tag('include', { widget => $tmpl->name }))
             or return $ctx->error($ctx->errstr);
-        $res .= $out if defined $out;
+        $res .= $out;
     }
     return $res;