Error if taxonomy module is disabled

On the odd occasion that the taxonomy module has been disabled in Drupal, an error occurs in userpoints_get_vid() because taxonomy_save_vocabulary($vocab) has not been declared and thus triggers a fatal error.

This patch would resolve this (admittedly) minor issue:

Index: sites/all/modules/userpoints/userpoints.module
===================================================================
--- sites/all/modules/userpoints/userpoints.module (Revision 1574)
+++ sites/all/modules/userpoints/userpoints.module (Arbeitskopie)
@@ -1669,6 +1669,9 @@ function userpoints_my_userpoints() {
* if no vocab exists it will create one
*/
function userpoints_get_vid() {
+ if (!module_exists('taxonomy')) {
+ return false;
+ }
//code lovingly inspired by the image.module w/ code by drewish
$vid = variable_get(USERPOINTS_CATEGORY_DEFAULT_VID, '');
if (empty($vid) || !taxonomy_get_vocabulary($vid)) {

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