CustonConfig imports withou try except

Python 2 is not supported now. The import is the same in try and except.

offlineimap/CustomConfig.py

@@ -18,13 +18,10 @@ import os
 import re
 from sys import exc_info
 import six
-
-try:
-    from configparser import SafeConfigParser, Error
-except ImportError: # Python3.
 from configparser import SafeConfigParser, Error
 from offlineimap.localeval import LocalEval
 
+
 class CustomConfigParser(SafeConfigParser):
     def __init__(self):
         SafeConfigParser.__init__(self)