Don't publish acquired attributes if acquired object has no docstring.

doc/CHANGES.rst

@@ -11,6 +11,9 @@ http://docs.zope.org/zope2/releases/.
 Bugs Fixed
 ++++++++++
  
+- LP #713253: Prevent publication of acquired attributes, where the acquired
+  object does not have a docstring.
+
 - Fix `LazyMap` to avoid unnecessary function calls.
 
 - LP 686664: WebDAV Lock Manager ZMI view wasn't accessible.

src/ZPublisher/BaseRequest.py

@@ -126,11 +126,11 @@ class DefaultPublishTraverse(object):
                     # Again, clear any error status created by __bobo_traverse__
                     # because we actually found something:
                     request.response.setStatus(200)
-                    return subobject
                 except AttributeError:
                     pass
 
                 # Lastly we try with key access:
+                if subobject is None:
                     try:
                         subobject = object[name]
                     except TypeError: # unsubscriptable

src/ZPublisher/tests/testBaseRequest.py

@@ -335,6 +335,14 @@ class TestBaseRequest(unittest.TestCase, BaseRequest_factory):
         r = self._makeOne(root)
         self.assertRaises(NotFound, r.traverse, 'folder/objBasic/noview')
 
+    def test_traverse_acquired_attribute_without_docstring(self):
+        from ZPublisher import NotFound
+        root, folder = self._makeRootAndFolder()
+        root._setObject('objBasic',
+                        self._makeObjectWithEmptyDocstring())
+        r = self._makeOne(root)
+        self.assertRaises(NotFound, r.traverse, 'folder/objBasic')
+
     def test_traverse_class_without_docstring(self):
         from ZPublisher import NotFound
         root, folder = self._makeRootAndFolder()