Handling exception from HybriAuth

- It seems HybridAuth throws an exception during instantiation if the
  user cancelled login from a provider (at least for Facebook).

Resolves #168

src/ScnSocialAuth/Controller/UserController.php

@@ -147,6 +147,11 @@ public function providerAuthenticateAction()
             return $this->notFoundAction();
         }
 
+        if (!$this->hybridAuth) {
+            // This is likely user that cancelled login...
+            return $this->redirect()->toRoute('zfcuser/login');
+        }
+
         // For provider authentication, change the auth adapter in the ZfcUser Controller Plugin
         $this->zfcUserAuthentication()->setAuthAdapter($this->getServiceLocator()->get('ScnSocialAuth-AuthenticationAdapterChain'));
 

src/ScnSocialAuth/Service/UserControllerFactory.php

@@ -21,15 +21,20 @@ class UserControllerFactory implements FactoryInterface
     public function createService(ServiceLocatorInterface $controllerManager)
     {
         $mapper = $controllerManager->getServiceLocator()->get('ScnSocialAuth-UserProviderMapper');
-        $hybridAuth = $controllerManager->getServiceLocator()->get('HybridAuth');
         $moduleOptions = $controllerManager->getServiceLocator()->get('ScnSocialAuth-ModuleOptions');
         $redirectCallback = $controllerManager->getServiceLocator()->get('zfcuser_redirect_callback');
 
         $controller = new UserController($redirectCallback);
         $controller->setMapper($mapper);
-        $controller->setHybridAuth($hybridAuth);
         $controller->setOptions($moduleOptions);
 
+        try {
+          $hybridAuth = $controllerManager->getServiceLocator()->get('HybridAuth');
+          $controller->setHybridAuth($hybridAuth);
+        } catch (\Zend\ServiceManager\Exception\ServiceNotCreatedException $e) {
+          // This is likely the user cancelling login...
+        }
+
         return $controller;
     }
 }