Comment 2 for bug 631979

The problem seems to be caused by a file that is renamed into a directory. I don't know how this rename ended up in the repository, but according to Jelmer it is a valid operation.

I made a small patch that appears to solve this problem for me, but I don't know if it might break in other cases. The patch stops fast-export from trying to rename all children of a file (which has no children).