Here Mudassar Ahmed Khan has explained with an example, how to show an element using ng-show directive when the Variable (Model) is not NULL and if the Variable (Model) is NULL or empty then the element must be hidden using AngularJS.
The AngularJS ng-show directive will be assigned a condition where the Variable (Model) will be tested for NULL and if the Variable (Model) is not NULL, the condition will return True, thus the element will be shown else vice-versa.