Fix plugin

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/dav/lib/CalDAV/Schedule/Plugin.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\DAV\CalDAV\Schedule;
+
+class Plugin extends \Sabre\CalDAV\Schedule\Plugin {
+
+	/**
+	 * Returns a list of addresses that are associated with a principal.
+	 *
+	 * @param string $principal
+	 * @return array
+	 */
+	protected function getAddressesForPrincipal($principal) {
+		$result = parent::getAddressesForPrincipal($principal);
+
+		if ($result === null) {
+			$result = [];
+		}
+
+		return $result;
+	}
+}

apps/dav/lib/Server.php

@@ -118,7 +118,7 @@ class Server {
 		// calendar plugins
 		$this->server->addPlugin(new \OCA\DAV\CalDAV\Plugin());
 		$this->server->addPlugin(new \Sabre\CalDAV\ICSExportPlugin());
-		$this->server->addPlugin(new \Sabre\CalDAV\Schedule\Plugin());
+		$this->server->addPlugin(new \OCA\DAV\CalDAV\Schedule\Plugin());
 		$this->server->addPlugin(new IMipPlugin($mailer, $logger));
 		$this->server->addPlugin(new \Sabre\CalDAV\Subscriptions\Plugin());
 		$this->server->addPlugin(new \Sabre\CalDAV\Notifications\Plugin());