Swapped false with null as it makes more sense semantically

Author: WyriHaximus

src/Filter/UrlEvent.php

@@ -80,6 +80,6 @@ public function getUrlSection($section)
             return $this->parsedUrl[$section];
         }
 
-        return false;
+        return null;
     }
 }

src/Filter/UrlSectionFilter.php

@@ -47,7 +47,7 @@ public function filter(EventInterface $event)
         }
 
         $section = $event->getUrlSection($this->section);
-        if ($section === false) {
+        if ($section === null) {
             return $this->strictResponse;
         }
 

tests/Filter/UrlEventTest.php

@@ -28,7 +28,7 @@ public function provideGetUrlSection()
             [
                 'scheme' => 'http',
                 'host'   => 'phergie.org',
-                'port'   => false,
+                'port'   => null,
             ]
         ];