Identifying orphan lines
 

I need to find all lines that aren't connected on both ends and I don't see a way to do this in the inspector. I'm cloning many layers based on a specific layer and it's difficult to tell after working on a layer if there are any lines that aren't unconnected on one end or the other, especially after cloning clones of the master layer. Is there a trick to finding out what lines need to be reconnected before moving on to the next layer?

Super program, enjoying the heck out of it, even as a newbie.