Merge pull request #313 in ZP/z-push from...

Merge pull request #313 in ZP/z-push from bugfix/ZP-1000-not-possible-to-accept-meeting-request to develop

* commit '5093d44d':
  ZP-1000 Not possible to accept meeting request on iPhone.

src/backend/kopano/mapiprovider.php

@@ -313,6 +313,7 @@ class MAPIProvider {
                     array_push($message->attendees, $attendee);
                 }
             }
+            $message->responsetype = $messageprops[$appointmentprops["responsestatus"]];
         }
 
         if (!isset($message->nativebodytype)) $message->nativebodytype = $this->getNativeBodyType($messageprops);