Merge pull request #82 from omniphx/bugfix/81

Check for refresh token before storing

Author: omniphx

src/Omniphx/Forrest/Authentications/WebServer.php

@@ -126,7 +126,9 @@ public function callback()
 
         // Encrypt token and store token and in storage.
         $this->storage->putTokenData($jsonResponse);
-        $this->storage->putRefreshToken($jsonResponse['refresh_token']);
+        if (isset($jsonResponse['refresh_token'])) {
+            $this->storage->putRefreshToken($jsonResponse['refresh_token']);
+        }
 
         // Store resources into the storage.
         $this->storeResources();