SmartionaryEntry associates of a SmartionaryEntry that have
null as their value.Example
Smartionary.purgeNull('fruits')Description
purgeNull() is the equivalient of calling a specific kind of find { }
closure:Map fruits = [
a: "apple",
b: "banana",
c: "cantaloupe",
d: "durian",
t: null
]fruits = fruits.findAll { k, v -> v != null }