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Use ng-if to only render the directive when user.id is defined:
ng-if
user.id
<my-directive user-id="user.id" ng-if="user.id"><id >= 0"></my-directive>
<my-directive user-id="user.id" ng-if="user.id"></my-directive>
<my-directive user-id="user.id" ng-if="user.id >= 0"></my-directive>
