title: Concatenate string with scope variables in template
body: <p>I have a case where I want to concatenate a string with scope defined variable like this :</p>
  
  <pre><code>$scope.variable1 = "Test Name";
  $scope.variable2 = "Test 2 Name";
  
  &lt;a href="#"&gt;{{variable1? "({{variable1}})" : variable2}}&lt;/a&gt;
  </code></pre>
  
  <p>I want when variable1 is set then display "(variable1)" otherwise "variable2".</p>