sqlite was made mandatory: import error can fail at import time

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

offlineimap/folder/LocalStatusSQLite.py

@@ -1,5 +1,5 @@
 # Local status cache virtual folder: SQLite backend
-# Copyright (C) 2009-2011 Stewart Smith and contributors
+# Copyright (C) 2009-2016 Stewart Smith and contributors
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -14,17 +14,13 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
 import os
+import six
+import sqlite3 as sqlite
 from sys import exc_info
 from threading import Lock
 
-import six
-
-try:
-    import sqlite3 as sqlite
-except:
-    pass #fail only if needed later on, not on import
-
 from .Base import BaseFolder