Get scripts is called multiple times per route

[allanchau]

Expected behaviour

Get scripts should only be called once.

Actual behaviour

It is called multiple times.

Steps to reproduce the behaviour

1. Create a route that uses req.flash().
2. Add a custom script to linz that uses the flash message if (req.flash('')) to load a custom script.
3. Notice the script never loads because get script is called multiple times.