Fix count() error on PHP 7.2 (bshaffer#872)

Lokomojo · bshaffer · commit 850df1e9e8f0 · 2017-09-19T13:08:41.000-07:00
diff --git a/src/OAuth2/Server.php b/src/OAuth2/Server.php
@@ -93,7 +93,7 @@ class Server implements ResourceControllerInterface,
     /**
      * @var array
      */
-    protected $responseTypes;
+    protected $responseTypes = [];
 
     /**
      * @var TokenTypeInterface
