Based on the feedback and the fact I added docs I decided to merge the changes 
into lp:zeitgeist as I need this for another fix I'm working on right now (bug 
revno: 1226 [merge]
committer: Markus Korn <>
branch nick: trunk
timestamp: Mon 2009-12-14 10:30:48 +0100
  * If GetEvents is called with an event id which does either not exist or is
    blocked a NULL_EVENT struct is returned (LP: #495392)
  * Documented this behaviour and also the fix for bug 495179

What to do if an event is not found or blocked when calling GetEvents (or its 
engine equivalent)
You received this bug notification because you are a member of Zeitgeist
Developers, which is the registrant for Zeitgeist Framework.

Status in Zeitgeist Framework: In Progress

Bug description:
Right now GetEvents raises a KeyError whenever any event is either not found or 
blocked by an extension. As good as this solution was in case of not found 
events it turns out to be bad for blocked events.

I think there are two possible solutions:
 * adding a NULLEvent, a somehow designed event datastructure which indicates 
"cannot find an event (with this id)"
 * raising a KeyError which somehow contains all failing/blocked event-ids. The 
client can now make another GetEvents call but remove all failing ids from the 

If we manage to find a good NULLEvent I think this solution makes the most 

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