Issue #2117: Don't choke on '+' path element in unrestrictedTraverse.

doc/CHANGES.txt

@@ -8,6 +8,9 @@ Zope Changes
 
     Bugs fixed
 
+      - Collector #2117: Don't choke in 'unrestrictedTraverse' for '+'
+        path elements.
+
       - Collector #2185: Log username for FCGI requests.
 
       - Collector #2152: Fixed MailHost documentation; simple_send does not

lib/python/OFS/Traversable.py

@@ -186,7 +186,7 @@ class Traversable:
 
                 bobo_traverse = getattr(obj, '__bobo_traverse__', None)
                 try:
-                    if name and name[:1] in '@+':
+                    if name and name[:1] in '@+' and name != '+':
                         # Process URI segment parameters.
                         ns, nm = nsParse(name)
                         if ns: