title: Optional space in angular interpolated string
body: <p>say I have an angular expression like this:</p>
  
  <pre><code>&lt;span&gt;{{vm.name}} {{vm.property|prettyPrint}}&lt;/span&gt;
  </code></pre>
  
  <p>Say that property is optional, and may result in empty string. How do I get rid of that no-longer-necessary space after the name? I tried doing something like</p>
  
  <pre><code>&lt;span&gt;{{vm.name + ' ' + vm.property|prettyPrint |trim}}&lt;/span&gt;
  </code></pre>
  
  <p>but that doesn't work. </p>