make sure ui.mode is defined initially

this fixes an issue with exiting buffer-less ui:
this happens only when the initial command fails for some reason.

1 files changed, 1 insertions, 1 deletions

diff --git a/alot/ui.py b/alot/ui.py
index 49c878b9..0fa94bc9 100644
--- a/alot/ui.py
+++ b/alot/ui.py
@@ -29,7 +29,7 @@ class UI(object):
     """points to currently active :class:`~alot.buffers.Buffer`"""
     dbman = None
     """Database Manager (:class:`~alot.db.manager.DBManager`)"""
-    mode = None
+    mode = 'global'
     """interface mode identifier - type of current buffer"""
     commandprompthistory = []
     """history of the command line prompt"""