title: Android DataBinding "??" notation and parametrized string from resources. How to avoid 'null' text?
body: <p>I have some <code>TextView</code>'s in my App that is compounded by a key from <code>strings.xml</code> resource file and a parameter that is passed dynamically. I use Android Data Binding where the '??' notation means it should replace nulls with blank strings, as example bellow shows. 
  But when the parameter value is null until the <code>TextView</code> is full loaded with data we see something like "null min" when I like it to be: " min".</p>
  
  <pre><code>&lt;TextView
      android:id="@+id/text_runtime"
      android:layout_width="wrap_content"
      android:layout_height="0dp"
      android:layout_weight="1"
      android:padding="2dp"
      android:text="@{@string/min(vm.runtime) ?? ``}"
      tools:text="120 min" /&gt;
  </code></pre>
  
  <p>in <code>strings.xml</code>:</p>
  
  <pre><code>&lt;string name="min"&gt;
      &lt;xliff:g id="min"&gt;%d&lt;/xliff:g&gt;
      min
  &lt;/string&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/kwGfL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kwGfL.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/EkpvR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EkpvR.png" alt="enter image description here"></a></p>