Mikel and me are testing some zope3 features in the camp5 sprint in North
Carolina and have seen an strange behaviour on the setindex.
the 'all_of' query performs an intersection of the results got for each
value in the query.
But whe one of the values takes no results, the 'values_to_documents.get(v)'
returns None and the IFBTree.intersection() of 'anytree' with None returns
We think that should return an empty tree instead. ¿?
Here you have a patch to include this use case in the tests and another
patch to implement this feature:
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