Fix bug in 2.6- except_cond3

uncompyle6/semantics/pysource.py

@@ -353,6 +353,7 @@ class SourceWalker(GenericASTTraversal, object):
                 'testtrue_then': ( 'not %p', (0, 22) ),
 
             })
+
         if 2.4 <= version <= 2.6:
             TABLE_DIRECT.update({
                 'comp_for':	( ' for %c in %c', 3, 1 ),
@@ -1901,6 +1902,10 @@ class SourceWalker(GenericASTTraversal, object):
             node[-2][0].kind = 'unpack_w_parens'
         self.default(node)
 
+    # except_cond3 is only in Python <= 2.6
+    n_except_cond3 = n_except_cond2
+
+
     def template_engine(self, entry, startnode):
         """The format template interpetation engine.  See the comment at the
         beginning of this module for the how we interpret format