MINOR: Check for a previously created CachedLink before calculating t…

…he link. This is set by the children() method in Hierarchy.php, to reduce the number of database queries

code/model/SiteTree.php

@@ -464,7 +464,13 @@ static public function link_shortcode_handler($arguments, $content = null, $pars
 	 * @return string
 	 */
 	public function Link($action = null) {
-		return Controller::join_links(Director::baseURL(), $this->RelativeLink($action));
+		$result = null;
+		if (isset($this->CachedLink)) {
+			$result = $this->CachedLink;
+		} else {
+			$result = Controller::join_links(Director::baseURL(), $this->RelativeLink($action));
+		}
+		return $result;
 	}
 
 	/**