check if caview really exists

.htaccess

@@ -1,8 +1,8 @@
 ErrorDocument 403 /core/templates/403.php
 ErrorDocument 404 /core/templates/404.php
 <IfModule mod_php5.c>
-php_value upload_max_filesize 513M
-php_value post_max_size 513M
+php_value upload_max_filesize 2000M
+php_value post_max_size 2000M
 php_value memory_limit 512M
 <IfModule env_module>
   SetEnv htaccessWorking true

apps/files_external/lib/webdav.php

@@ -36,8 +36,10 @@ class OC_FileStorage_DAV extends OC_Filestorage_Common{
 			$this->root.='/';
 		}
 		
-		$caview = \OCP\Files::getStorage('files_external');
-		$capath=\OCP\Config::getSystemValue('datadirectory').$caview->getAbsolutePath("");
+		$capath = '';
+		if($caview = \OCP\Files::getStorage('files_external')) {
+			$capath=\OCP\Config::getSystemValue('datadirectory').$caview->getAbsolutePath("");
+		}
 		$settings = array(
 			'baseUri' => $this->createBaseUri(),
 			'userName' => $this->user,