Question on Coolant Line?
 

I was looking under the hood last night, and noticed something that just doesn't seem right to me. I have a AWM 1.8T engine. On the driver side of the engine directly underneath the intake manifold, there is (what i believe to be) a coolant line. it runs front/bottom of engine to the back. At the middle of it, right next to the oil filter, there is a t coming off it. In the pictures below (sorry for bad lighting) you can see that line is capped/blocked off. Is this normal for these engines? If so, what is the point of that extra line coming off to go nowhere?

Thanks for your help.