added some checking on checkResponse() since it was complaining about json_decode only accepting strings

Author: andrecastelo

src/Provider/BattleNet.php

@@ -85,8 +85,8 @@ protected function getDefaultScopes()
     protected function checkResponse(ResponseInterface $response, $data)
     {
         if ($response->getStatusCode() != 200) {
-            $data = json_decode($data, true);
-            throw new IdentityProviderException($data['message'], $response->getStatusCode(), $data);
+            $data = (is_array($data)) ? $data : json_decode($data, true);
+            throw new IdentityProviderException($data['error_description'], $response->getStatusCode(), $data);
         }
     }
 }