title: ngIf check if object is empty [done]
body: <p>i have a list name "day".</p>
  
  <pre><code>export class Day{
      id:number;
      name: string;
      items: Object;
  }
  </code></pre>
  
  <p>i want to display "Hello" when items is empty. I try to used *ngIf but it doesn't work.
  This is my code.</p>
  
  <pre><code>&lt;div class=" list" *ngFor="let day of days"&gt;
      &lt;div class="list-name"&gt;
          &lt;strong&gt;
              {{day.name}}
          &lt;/strong&gt;
          &lt;div *ngIf= "day.items === 0"&gt;
              Hello
          &lt;/div&gt;
      &lt;/div&gt;
      &lt;div *ngFor="let item of day.items"&gt;
          &lt;div class="column" [style.background-image]="'url(' + item.photoPath + ')'"&gt;
              &lt;h4 class="item-name"&gt;{{item.name}}&lt;/h4&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>