title: Angular *ngIf variable with async pipe multiple conditions
body: <p>There's quite good doc of using *ngIf in Angular: <a href="https://angular.io/api/common/NgIf" rel="noreferrer">https://angular.io/api/common/NgIf</a>
  But, is that possible to have *ngIf async variable and multiple checks on that?
  Something like:</p>
  
  <pre><code>&lt;div *ngIf="users$ | async as users &amp;&amp; users.length &gt; 1"&gt;
  ...
  &lt;/div&gt;
  </code></pre>
  
  <p>Of course, it's possible to use nested *ngIf, like:</p>
  
  <pre><code>&lt;div *ngIf="users$ | async as users"&gt;
      &lt;ng-container *ngIf="users.length &gt; 1"&gt;
      ...
      &lt;/ng-container&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>but it'd be really nice to use only one container, not two.</p>