Initialiser lists don't work for member references in gcc 4.8, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50025

(This issue is apparently fixed in gcc 4.9, but at least my distro
still ships 4.8 by default.)

This syntax was originally introduced in:
ba7128b30850594c7efb258d1794e377eede364a

Don't crash when removing last account

Under certain circumstances, removing the last (or only) remaining account
causes kube to crash.

Steps to reproduce:

1. clear all sink config folders
2. start kube, add a generic IMAP account
3. close kube, reopen kube
4. open accounts list, select "edit"
5. Select "Delete" -> kube crashes