Fix issue2550994: breakage caused by configparser backports.

Author: jsm28

CHANGES.txt

@@ -39,6 +39,8 @@ Fixed:
 - issue2550993: fixed edit CSV action to update restored items to the
   new value instead of restoring with the previous value (Christof
   Meerwald)
+- issue2550994: avoid breakage caused by use of backports of Python 3
+  configparser module to Python 2. (Joseph Myers)
 
 
 2018-07-13 1.6.0

roundup/configuration.py

@@ -2,17 +2,22 @@
 #
 __docformat__ = "restructuredtext"
 
-try:
+# Some systems have a backport of the Python 3 configparser module to
+# Python 2: <https://pypi.org/project/configparser/>.  That breaks
+# Roundup if used with Python 2 because it generates unicode objects
+# where not expected by the Python code.  Thus, a version check is
+# used here instead of try/except.
+import sys
+if sys.version_info[0] > 2:
     import configparser			# Python 3
-except ImportError:
+else:
     import ConfigParser as configparser	# Python 2
 
 import getopt
 import imp
 import logging, logging.config
 import os
 import re
-import sys
 import time
 import smtplib