Merge bugfix from 1_4 branch.

lib/python/Products/PageTemplates/CHANGES.txt

@@ -9,3 +9,9 @@ Page Template changes
       Bugs Fixed
 
         - Tracebacks were often truncated.
+
+        - __bobo_traverse__ objects, such as the root, triggered
+          security incorrectly when traversed.
+
+        - If a PageTemplate was owned by a missing user, or one with
+          insufficient permissions, the editing form broke.

lib/python/Products/PageTemplates/ZopePageTemplate.py

@@ -87,7 +87,7 @@
 Zope object encapsulating a Page Template.
 """
 
-__version__='$Revision: 1.17 $'[11:-2]
+__version__='$Revision: 1.18 $'[11:-2]
 
 import os, AccessControl, Acquisition, sys
 from Globals import DTMLFile, MessageDialog, package_home
@@ -375,6 +375,7 @@ def initialize(context):
     ZopePageTemplate.manage = _editForm
     ZopePageTemplate.manage_main = _editForm
     ZopePageTemplate.pt_editForm = _editForm
+    _editForm._owner = None
     context.registerClass(
         ZopePageTemplate,
         permission='Add Page Templates',