removed unused $smarty->_error_msg

libs/Smarty.class.php

@@ -399,13 +399,6 @@ class Smarty
  * There should be no need to touch anything below this line.
  * @access private
  */
-    /**
-     * error messages. true/false
-     *
-     * @var boolean
-     */
-    var $_error_msg            = false;
-
     /**
      * where assigned template vars are kept
      *
@@ -1432,7 +1425,6 @@ class Smarty
 
             return true;
         } else {
-            $this->trigger_error($smarty_compiler->_error_msg);
             return false;
         }