minor #10717 unified return null usages (fabpot)

This PR was merged into the 2.3 branch.

Discussion
----------

unified return null usages

| Q             | A
| ------------- | ---
| License       | MIT

This PR unifies the way we return `null` from a function or method:

 * always use `return;` instead of `return null;` (the current code base uses both);
 * never use `return;` at the end of a function/method.

Commits
-------

d1d569b unified return null usages

Author: fabpot

Bundle/Bundle.php

@@ -141,7 +141,6 @@ public function getPath()
      */
     public function getParent()
     {
-        return null;
     }
 
     /**

HttpCache/Store.php

@@ -121,7 +121,7 @@ public function lookup(Request $request)
         $key = $this->getCacheKey($request);
 
         if (!$entries = $this->getMetadata($key)) {
-            return null;
+            return;
         }
 
         // find a cached entry that matches the request.
@@ -135,7 +135,7 @@ public function lookup(Request $request)
         }
 
         if (null === $match) {
-            return null;
+            return;
         }
 
         list($req, $headers) = $match;
@@ -146,7 +146,6 @@ public function lookup(Request $request)
         // TODO the metaStore referenced an entity that doesn't exist in
         // the entityStore. We definitely want to return nil but we should
         // also purge the entry from the meta-store when this is detected.
-        return null;
     }
 
     /**

Profiler/FileProfilerStorage.php

@@ -116,7 +116,7 @@ public function purge()
     public function read($token)
     {
         if (!$token || !file_exists($file = $this->getFilename($token))) {
-            return null;
+            return;
         }
 
         return $this->createProfileFromData($token, unserialize(file_get_contents($file)));
@@ -215,7 +215,7 @@ protected function readLineFromFile($file)
         $position = ftell($file);
 
         if (0 === $position) {
-            return null;
+            return;
         }
 
         while (true) {

Profiler/PdoProfilerStorage.php

@@ -77,8 +77,6 @@ public function read($token)
         if (isset($data[0]['data'])) {
             return $this->createProfileFromData($token, $data[0]);
         }
-
-        return null;
     }
 
     /**

Profiler/Profiler.php

@@ -273,13 +273,13 @@ public function get($name)
     private function getTimestamp($value)
     {
         if (null === $value || '' == $value) {
-            return null;
+            return;
         }
 
         try {
             $value = new \DateTime(is_numeric($value) ? '@'.$value : $value);
         } catch (\Exception $e) {
-            return null;
+            return;
         }
 
         return $value->getTimestamp();