user model: if we don't get an explicit username, use the active user

and while we're at it change spaces to tabs

application/models/user.php

@@ -188,7 +188,9 @@ class User extends CI_Model {
 	 */
 	public function profile($username = '', $isCode = false) {
 		if (empty($username)) {
-            return false;
+			@$username = $this->session->userdata('username');
+			if(empty($username))
+				return FALSE;
 		}
 
 		$this->db->select('users.*, groups.name AS `group`, groups.description AS `group_description`');