title: error with default value in Databinding
body: <p>As described in <a href="https://developer.android.com/topic/libraries/data-binding/index.html#studio_support" rel="noreferrer">Databinding document</a> we can use <code>default</code> to check value in preview pane.</p>
  
  <p>It is working perfectly if i have simple String like below :</p>
  
  <pre><code>android:text="@{place, default=Columbia}"
  </code></pre>
  
  <p>But i have combination of state and country and if i am using ,(comma) then it is creating problem.</p>
  
  <pre><code>android:text="@{place, default=Gujarat, IN}"
  </code></pre>
  
  <p>It is showing error <code>, unexpected</code>, How to resolve it?</p>
  
  <p><a href="https://i.stack.imgur.com/99T7C.png" rel="noreferrer"><img src="https://i.stack.imgur.com/99T7C.png" alt="enter image description here"></a></p>
  
  <p>I know still we can use <code>tools:text</code> to check output in preview pane, but how to overcome this issue in <code>Databinding</code> with <code>default</code>?</p>