Fixing php Fatal error

When running php 5.3.28, I ran into this error:

Fatal error: Can't use method return value in write context in /var/www/site/extensions/versatile_router/extension.driver.php on line 88

Setting the `Frontend::Page()` portion to a variable and then passing it into `empty` solved this problem.
Merge pull request #1 from dtan/master

Fixing php Fatal error