import getglobalui as we use it

This branch is currently broken, as we were using getglobalui() but it
was not imported. This fixes the missing import and makes offlineimap
run successfully.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/folder/Base.py

@@ -18,6 +18,7 @@
 
 from threading import *
 from offlineimap import threadutil
+from offlineimap.ui import getglobalui
 import os.path
 import re
 import sys