Add NULL to the function list.

Idea created by oceanwest on Nov 18, 2015
    • jbante
    • mardikennedy
    • robertnaud

    reading "" for null makes reading code difficult.


    - if the file is restricted to the latest version (when this function is implemented) then it would be nice that any file with a Null custom function it would be replaced by the native function.


    Any instances with of double quotes in any calculations would be converted to NULL.