various fixes (#3190)

* fix: Call to a member function parent() on null

* fix: notice

fixes Trying to get property plaintext of non-object at bridges/WikiLeaksBridge.php line 96

* fix: CommonDreamsBridge

bridges/CommonDreamsBridge.php

@@ -21,10 +21,11 @@ class CommonDreamsBridge extends FeedExpander
 
     private function extractContent($url)
     {
-        $html3 = getSimpleHTMLDOMCached($url);
-        $text = $html3->find('div[class=field--type-text-with-summary]', 0)->innertext;
-        $html3->clear();
-        unset($html3);
+        $dom = getSimpleHTMLDOMCached($url);
+        $summary = $dom->find('div.node__body', 0);
+        $text = $summary->innertext;
+        $dom->clear();
+        unset($dom);
         return $text;
     }
 }