Update to Drupal 8.1.2. For more information, see https://www.drupal.org/project/drupal/releases/8.1.2

core/lib/Drupal/Core/EventSubscriber/AjaxResponseSubscriber.php

@@ -94,7 +94,7 @@ class AjaxResponseSubscriber implements EventSubscriberInterface {
         // the JSON data by making it the value of a textarea.
         // @see http://malsup.com/jquery/form/#file-upload
         // @see https://www.drupal.org/node/1009382
-        $response->setContent('<textarea>' . $response->getContent()  . '</textarea>');
+        $response->setContent('<textarea>' . $response->getContent() . '</textarea>');
       }
 
       // User-uploaded files cannot set any response headers, so a custom header

core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php

@@ -56,4 +56,5 @@ class EntityRouteAlterSubscriber implements EventSubscriberInterface {
     $events[RoutingEvents::ALTER][] = array('onRoutingRouteAlterSetType', -150);
     return $events;
   }
+
 }

core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php

@@ -286,4 +286,5 @@ class FinishResponseSubscriber implements EventSubscriberInterface {
     $events[KernelEvents::RESPONSE][] = array('onRespond');
     return $events;
   }
+
 }

core/lib/Drupal/Core/EventSubscriber/KernelDestructionSubscriber.php

@@ -62,4 +62,5 @@ class KernelDestructionSubscriber implements EventSubscriberInterface, Container
     $events[KernelEvents::TERMINATE][] = array('onKernelTerminate', 100);
     return $events;
   }
+
 }

core/lib/Drupal/Core/EventSubscriber/ParamConverterSubscriber.php

@@ -48,4 +48,5 @@ class ParamConverterSubscriber implements EventSubscriberInterface {
     $events[RoutingEvents::ALTER][] = array('onRoutingRouteAlterSetParameterConverters', -220);
     return $events;
   }
+
 }

core/lib/Drupal/Core/EventSubscriber/PathSubscriber.php

@@ -75,4 +75,5 @@ class PathSubscriber implements EventSubscriberInterface {
     $events[KernelEvents::TERMINATE][] = array('onKernelTerminate', 200);
     return $events;
   }
+
 }

core/lib/Drupal/Core/EventSubscriber/RedirectResponseSubscriber.php

@@ -170,4 +170,5 @@ class RedirectResponseSubscriber implements EventSubscriberInterface {
     $events[KernelEvents::REQUEST][] = array('sanitizeDestination', 100);
     return $events;
   }
+
 }

core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php

@@ -53,4 +53,5 @@ class RequestCloseSubscriber implements EventSubscriberInterface {
 
     return $events;
   }
+
 }