Merge pull request #2056 from splitbrain/validActionDropdown

Create valid empty option in tpl_actiondropdown

inc/template.php

@@ -1645,7 +1645,7 @@ function tpl_mediaTree() {
  * @param string $empty empty option label
  * @param string $button submit button label
  */
-function tpl_actiondropdown($empty = '', $button = '>') {
+function tpl_actiondropdown($empty = ' ', $button = '>') {
     global $ID;
     global $REV;
     global $lang;