xffm crash with empty dir

[Jasper Huijsmans]

edscott,

this crash is repeatable for me:

1) open a directory containing only one item
2) trash the last item => xffm shows empty row
3) dnd copy something => sometimes crash, sometimes it's copied, but
   xffm still shows empty row above new item
4) double click on empty row => crash

I have the local waste baskets hidden. It doesn't happen if I show them
(there is no empty row then).

	Jasper