Fix issue with widget without widget_map

Backport of #19

Author: Alexis Lefebvre

Resolver/WidgetSearchContentResolver.php

@@ -112,7 +112,7 @@ public function getWidgetStaticContent(Widget $widget)
                             $_result = $_result->getResult();
 
                             if ($_result->getScore() > 0.4) {
-                                if ($_entity instanceof Widget) {
+                                if ($_entity instanceof Widget && null !== $_entity->getWidgetMap()) {
                                     $view = $_entity->getWidgetMap()->getView();
                                     if ($this->isPageAccessible($view)) {
                                         if (!in_array($view->getId(), $alreadyAdded) && !$view instanceof Template) {