Comment 10 for bug 23110

Created an attachment (id=4387)
patch

If the backtrace you're getting is the same as the one in comment 5, something
odd is going on - as the top 7 functions of thread 1 are wrong.

I think I've managed to figure out what bit of the code is crashing. The
problem is that someone one of the string properties of an entry is getting set
to NULL, which causes problems all over the place.

I'm attaching a patch that adds (a considerable number of) checks for NULL in
the entry-view sorting functions, which I think is where the crash is.