Don't raise a ValueError if a property doesn't exists.

Signed-off-by: Rene Jochum <rene@jochums.at>

CHANGES.rst

@@ -19,6 +19,10 @@ Bug fixes:
   but an error.
   [pcdummy]
 
+- Don't raise an ValueError if a property doesn't exists for a ZOPE
+  user.
+  [pcdummy]
+
 
 5.0.10 (2016-05-02)
 -------------------

src/Products/PlonePAS/tools/memberdata.py

@@ -301,7 +301,13 @@ def getProperty(self, id, default=_marker):
             # we won't always have PlonePAS users, due to acquisition,
             # nor are guaranteed property sheets
             if not sheets:
-                return BaseMemberData.getProperty(self, id, default)
+                try:
+                    return BaseMemberData.getProperty(self, id, default)
+                except ValueError:
+                    # Zope users don't have PropertySheets,
+                    # return an empty string for them if the property
+                    # doesn't exists.
+                    return ''
 
         # If we made this far, we found a PAS and some property sheets.
         for sheet in sheets: