Angularjs filter not null

Angular >=1.3.16 to latest (1.5.5 at time of writing/update) use '' (empty string) (or '!!' also works)

<ul>
    <li ng-repeat="detail in details | filter:{shortDescription: ''}">
        <p>{{detail.shortDescription}}</p>
    </li>
</ul>

Example: http://jsfiddle.net/TheSharpieOne/1mnachk6/

Angular >=1.3.6 and <=1.3.15 use '!null'

<ul>
    <li ng-repeat="detail in details | filter:{shortDescription: '!null'}">
        <p>{{detail.shortDescription}}</p>
    </li>
</ul>

Example: http://jsfiddle.net/TheSharpieOne/4wxs67yv/

Angular >=1.2 and <=1.3.5 use '' (empty string) (or '!!' also works)

<ul>
    <li ng-repeat="detail in details | filter:{shortDescription: ''}">
        <p>{{detail.shortDescription}}</p>
    </li>
</ul>

Example: http://jsfiddle.net/TheSharpieOne/ovsqf17n/

Angular <1.2 '!!'

<ul>
    <li ng-repeat="detail in details | filter:{shortDescription: '!!'}">
        <p>{{detail.shortDescription}}</p>
    </li>
</ul>

Example: http://jsfiddle.net/TheSharpieOne/RGEdc/

Overall, '!!' has the best support, but '' (empty string) is recommended and intended for this.