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Generic SObject Getters Return Null for Boolean fields?
In Apex Boolean is an object and has to be initialized. You can assign "Apex Booleans" three different values: "true, false, null".
If you decelerate a Boolean variable the standard value is NULL. … For example, initialize a Boolean variable to false.
( Learn more about primitive data types: http://www.salesforce.com/us/developer/docs/apexcode/Content/langCon_apex_primitives.htm ) …