title: Check if ListView is empty in flutter
body: <p>Is there a way to check if ListView is empty.</p>
  
  <pre><code>ListView.builder(
    itemCount: _items.length,
    itemBuilder: (context, index) {
      return _buildFilteredItem(context, index);
    },
  )
  </code></pre>
  
  <p>I want to search through my items and if its empty show a Text widget saying no items found. _buildFilteredItem returns null if the item could not be found.</p>