FEATURE: add permissions into widgets and fix few bugs

app/Http/Controllers/Admin/Search.php

@@ -13,7 +13,6 @@ class Search extends Controller
 {
     /**
      * Create form for searching
-     *
      * @return $this|\Illuminate\Contracts\View\Factory|\Illuminate\View\View
      */
     public function getSearch()
@@ -37,7 +36,6 @@ class Search extends Controller
 
     /**
      * Method used for performing search.
-     *
      * This method iterates over all registered search engines and returns results for each engine apart.
      *
      * @param string $term search text
@@ -60,10 +58,16 @@ class Search extends Controller
             // try to find given term
             $results = $search->search($term);
 
+            $content = $presenter->render($results);
+
+            if (is_null($content)) {
+                continue;
+            }
+
             // create result object
             $resultsParts[$search->getId()] = [
                 'name'    => $search->getName(),
-                'content' => $presenter->render($results),
+                'content' => $content,
                 'count'   => count($results)
             ];
         }