Moved memcache instantiation inside an if() that checks for cache_config and also that memcache exists using class_exists().

This should let us still do development on chameleon without requiring the memcache extension.

webtools/addons/public/inc/init.php

@@ -48,18 +48,21 @@ define('SCRIPT_NAME',substr($_SERVER['SCRIPT_NAME'], strlen(WEB_PATH.'/'), strle
  */
 $memcacheId = md5(SCRIPT_NAME.$_SERVER['QUERY_STRING']);
 
+/**
+ * Check the cache_config to see if the current page is supposed to be cached.
+ * If it is, try to connect.  If connection to the cache server fails, fall back on regular runtime.
+ * We also are storing the status of the connection in $memcacheConnected for use in finish.php.
+ */
+if (!empty($cache_config[SCRIPT_NAME]) && class_exists('memcache') ) {
+
     /**
      * Instantiate our memcache object.
      */
     $cache = new memcache();
 
     /**
- * Check the cache_config to see if the current page is supposed to be cached.
- * If it is, try to connect.  If connection to the cache server fails, fall back on regular runtime.
- * We also are storing the status of the connection in $memcacheConnected for use in finish.php.
+     * Boolean so we know whether or not we've found a valid memcached server.
      */
-if (!empty($cache_config[SCRIPT_NAME]) ) {
-    
     $memcacheConnected = false;
 
     if (is_array($memcache_config)) {