[rules-users] null checking

[samd]

How do I evaluate null conditions in the following case for example?

seller: ( seller.cheese != null && seller.active == true )
cheese: ( cheese.type == "chedder" ) from seller.cheese

In the above example seller.cheese is null but seller is used in the second
part of the rule since we can't evaluate facts for null for some reason how
do you check for a null condition.

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