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10.0 - Unable to test for null values in Field Calculator. Why not?

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I have a short integer field. I'm trying to perform some field calculations, and need to reassign null values. None of these options work in 10.0 SP5's field calculator:

1 if !INVASV_PCT! is None

1 if not !INVASV_PCT!

How do I assign a value of 1 to records that are null? Because both of the above should work in Python. What am I doing wrong? Thanks

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