Invert null comparison order

tests/functional/ProjectControllerTest.php

@@ -254,7 +254,7 @@ class ProjectControllerTest extends WebTestCase
         $dom_xml = self::getDomDocument($capsule_directory);
         $video_node = $dom_xml->getElementsByTagName('video')->item(0);
 
-        if ($video_node === null) {
+        if (null === $video_node) {
             throw new \Exception("Video node could not be found in XML project file");
         }