Issues in magic methods __isset and __get

[mleko64]

Hello!
I found issues in classes\Smarty\View.php file:

1. In magic method __get() should be:

if ( $var instanceof Smarty_Undefined_Variable ) {

instead of

if ( $var instanceof Undefined_Smarty_Variable ) {

2. In magic method __isset() should be:

return $this->_smarty->getVariable($key)->value!==NULL;

instead of

return $this->_smarty->getVariable($key)->value===NULL;