The attached branch adds a NULL_EVENT to the datamodel.
I think the branch is not ready to be merged yet, still needs some tweaks.
But it should give the general idea of how this could work.
The ZeitgeistClient automatically translates a received NULL_EVENT to None.

** Branch linked: lp:~thekorn/zeitgeist/null_event

** Changed in: zeitgeist
     Assignee: (unassigned) => Markus Korn (thekorn)

** Changed in: zeitgeist
       Status: New => In Progress

What to do if an event is not found or blocked when calling GetEvents (or its 
engine equivalent)
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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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