title: Can't show title of reference (many) content type from Contentful (Angular)
body: <p>Hey i have content_type category with two fields - title and subcategory.Sub category is reference with option many, but when i try to show all subcategories i have error in console &quot;Can't read property 'title' of undefined&quot;. I can't figure why.</p>
  <p>In my contentful-api service i have :</p>
  <pre><code>getCategory(query?: object): Promise&lt;EntryCollection&lt;Category&gt;&gt; {
  return this.clientApi.getEntries&lt;Category&gt;(
    Object.assign({}, query, { content_type: 'categories', include: 2})
  );
  </code></pre>
  <p>}</p>
  <p>After that in my component.ts file i have :</p>
  <pre><code>export class Component implements OnInit {
  
    categories: Array&lt;Entry&lt;Category&gt;&gt;;
  
    constructor(private contentfulApiService: ContentfulApiService) { }
  
    ngOnInit(): void {
  
      this.contentfulApiService
        .getCategory()
        .then((categories) =&gt; (this.categories = categories.items));
    }
  }
  </code></pre>
  <p>And in my component.html :</p>
  <pre><code>  &lt;ul&gt;
      &lt;li *ngFor=&quot;let category of categories&quot;&gt;
        {{ category.fields.subCategories.fields.title }}
      &lt;/li&gt;
    &lt;/ul&gt;
  </code></pre>
  <p>If i switch reference to single from Contentful, everything works. But i need to be many so i can assign many subcategories and show it all.</p>
  <p>Please help me.</p>