bug fix on relation.registry: don't crash invalidateRelation when object is not registered in intIds

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1194 fd906abe-77d9-0310-91a1-e0d9ade77398

relation/registry.py

@@ -253,13 +253,15 @@ def invalidateRelations(context, event):
     # if not IRelatable.providedBy(event.object):
     #     return
     relations = []
-    #registry = zapi.queryUtility(IRelationRegistry)
     registries = zapi.getAllUtilitiesRegisteredFor(IRelationRegistry)
     for registry in registries:
         for attr in ('first', 'second', 'third'):
+            try:
                 relations = registry.query(**{attr: context})
                 for relation in relations:
                     registry.unregister(relation)
+            except KeyError:
+                pass
 
 def removeRelation(context, event):
     """ Handles IRelationInvalidatedEvent by removing the relation