How to remove layout from assembly

I am working on an assembly and for some reason the icon in the feature tree shows that is has a layout (shown in red box) but there is no layout.

If I click on the layout button there is nothing in the layout as you can see.

Is there a way to get rid of the icon on there or am I stuck with it?  I know it probably doesn't matter but if I can get rid of it I would be happier.

Thanks in advance for your help!!!

Chris

SolidworksAssemblies