Empty branch box with Clone Side Branch leads to a crash

[davidh]

Cloning a Side Branch using Num pad+ does not refresh the tree.
You need to click the image or move the browser separator bar.

An empty branch box allows to Clone Side Branch which leads to a crash if either the main or the local menu command is used.

[jsachs]

I do not see the first problem here. I fixed the second one for 16-May release.

[davidh]

I do not see the first problem in Alpha 16-May any more.