title: ExtJS 5.1 -- My Store is empty, but emptyText is not appearing?
body: <p>I have read quite a few articles and posts and everything I've tried has not worked. I am using ExtJS 5.1. </p>
  
  <p><strong>Handler bound to <code>change</code> event:</strong></p>
  
  <pre><code>'combobox': {
      change: 'onComboboxChange'  // filter when box value is changed
  }
  </code></pre>
  
  <p><strong>Here is the <code>change</code> handler:</strong></p>
  
  <pre><code>onComboboxChange: function (combobox, newValue, oldValue, eOpts) {
      var store = Ext.getStore('MyStore');
      store.removeFilter('myFilter');
      if (newValue !== 'All') {
          store.addFilter({
              id: 'myFilter',
              filterFn: function (record) {
                  return record.get('status').toLowerCase() === newValue.toLowerCase();
              }
          });
      } // AT THIS POINT IN THE FUNCTION store.getCount() === 0
  }
  </code></pre>
  
  <p><strong>Question:</strong> When I click an option in the combo box that yields no results in the store, the empty text does not show. It used to work when I had another combo box, so something must be wrong with this. I even step through with debugger and check to make sure the actual count is 0, and it is, and the empty text still does now show.</p>