null is now the empty set (as a result of set operations).  Also, single length array results are converted to single elements.
null is now the empty set (as a result of set operations).  Also, single length array results are converted to single elements.

Signed-off-by: Richard Minerich <6fbd7679d73634e019af967c70f8a81deb306112@gmail.com>

Rickasaurus/Barb