title: SonarQube Blocker Issue NullPointerException might be thrown as 'contacts' is nullable here
body: <p>I have a method that returns list of contacts. When I am running this code on SonarQube server. It shows a blocker issue stating <strong>NullPointerException might be thrown as 'contacts' is nullable here.</strong>. How to resolve this?</p>
  
  <pre><code>    List&lt;Contact&gt; getContactDetails(){...}
  
      public void checkSize() {
        List&lt;Contact&gt; contacts = getContactDetails(); 
        syso(contacts.size()); 
      }
  </code></pre>