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Due to a change in how the query is constructed, sqla is producing incorrect SQL when given and empty and_() clause.
Fix is to return None instead of empty and_() clause.
http://git.fedorahosted.org/git/?p=beaker.git;a=commitdiff;h=d3bfef1f1c00149e9767a577b32c327a86903a52 Released as Beaker 0.6.8-3 hotfix yesterday.