A function with return type must return a value

File: .../winder.nom.za/nette/app/Presenters/HomePresenter.php:24

14:        {
15:            foreach($this->getFeedlyBoards() as $board)
16:            {
17:                if(!isset($board['id']))
18:                    continue;
19:                    
20:                $encodedID = str_replace('/', '&', $board['id']);
21:                $list[$encodedID]['name'] = $board['label'];
22:                $articles = $this->getArticles($board['id']);
23:                if(!isset($articles['id']))
24:                return;
25:                foreach($articles['items'] as $article)
26:                {
27:                    $list[$encodedID]['items'][] = ['title' => $article['title'], 'url' => $article['url']];
28:                }