title: angularjs filtering with exact match returns null values in latest versions
body: <p>Myself have a angularjs sample with <a href="https://jsfiddle.net/mpsbhat/y07qtwj6/" rel="nofollow">filters here</a> where i can filter the values with exact match using the <code>true</code> comparator as,</p>
  
  <pre><code> &lt;table&gt;
          &lt;tr ng-repeat="user in users | filter:{name: name, phone: phone} : true"&gt;
              &lt;td&gt;{{user.name}}&lt;/td&gt;
              &lt;td&gt;{{user.phone}}&lt;/td&gt;
              &lt;td&gt;{{user.secret}}&lt;/td&gt;
          &lt;/tr&gt;
      &lt;/table&gt;
  </code></pre>
  
  <p>It works great with combination filters when using angularjs version <code>1.1.5</code> where as it returns null for other angularjs versions when user filters and return back to <code>--select--</code> position. </p>
  
  <p>Reference: <a href="https://jsfiddle.net/mpsbhat/y07qtwj6/1/" rel="nofollow">with angularjs 1.1.5</a>
  , <a href="https://jsfiddle.net/mpsbhat/y07qtwj6/" rel="nofollow">with angularjs 1.4.x</a></p>