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

Assigning the `Frontend::Page()...` portion to a variable and then passing it into `empty()` solved this problem.

Here's the full stack trace:
![screen shot 2014-02-22 at 11 10 45 am](https://f.cloud.github.com/assets/18066/2238090/eb69e018-9bdb-11e3-907b-88da4ba773d0.png)