functions_routing.php: set action to empty when serving JS

genpage is called but no action given -
the default page was generated at every call.

Cherry-picked from master branch.

Signed-off-by: Thomas Hochstein <thh@inter.net>

docs/NEWS

@@ -1,6 +1,9 @@
 Version 2.3.3-beta1 ()
 ------------------------------------------------------------------------
 
+   * Fix: Set action to empty in functions_routing.php when serving JS;
+     otherisw the default page has been generated at every call.
+
    * media_choose.tpl: Fixes bad usage of
      {serendipity_hookPlugin eventData=...} to {serendipity_hookPlugin eventData=}
      and allow plugins to skip HTML block insertion to use their own

include/functions_routing.inc.php

@@ -132,6 +132,10 @@ function serveJS($js_mode) {
     header('Content-type: application/javascript; charset=' . LANG_CHARSET);
 
     $out = "";
+    // FIXFIX: including genpage without any given action will generate the
+    // default page which is unneccessary, set action to empty to only make
+    // the fix below
+    $serendipity['GET']['action'] = 'empty';
 
     include(S9Y_INCLUDE_PATH . 'include/genpage.inc.php');