Changes.get_latest_author_by_email() was broken under Python 3.

This is because of the patch committed with revision 68a6e90228. As
Python 3 stores unicode strings by default, we need to convert them back.

This change will hopefully fix it once and for all.

gitinspector/changes.py

@@ -21,6 +21,7 @@ from __future__ import print_function
 from __future__ import unicode_literals
 from localization import N_
 from outputable import Outputable
+import codecs
 import datetime
 import extensions
 import filtering
@@ -179,6 +180,9 @@ class Changes:
 		return self.authors_dateinfo
 
 	def get_latest_author_by_email(self, name):
+		if not hasattr(name, 'decode'):
+			name = str.encode(name)
+
 		name = name.decode("unicode_escape", "ignore")
 		return self.authors_by_email[name]