OC 2.0.0.1b: Fixed not loading flexslider in manufacturers error page carousel

This is what the carousel looks like in the manufacturer's error page without flexslider css and js scripts loaded.
I added style and script in case manufacturer_id=0.

![2014-10-22 04_21_19-brand not found](https://cloud.githubusercontent.com/assets/8582633/4729591/023f2458-598a-11e4-9003-f5b67084f1f0.png)