asascience-open/wicken — pull request #3 by dstuebe (2013-09-27 15:05:49+00:00)
Title: Cleared up behavior of get operations

dogma.belief_does_not_exist raises an attribute error
dogma.value_does_not_exist raises a DogmaGetterSetterException
dogma.value_exists returns whatever the value is - could be None, "" or 'foobar'