fix webdav storage backend when trying to open a non existing file for reading

apps/files_external/lib/webdav.php

@@ -131,6 +131,9 @@ class OC_FileStorage_DAV extends OC_Filestorage_Common{
 		switch($mode) {
 			case 'r':
 			case 'rb':
+				if(!$this->file_exists($path)) {
+					return false;
+				}
 				//straight up curl instead of sabredav here, sabredav put's the entire get result in memory
 				$curl = curl_init();
 				$fp = fopen('php://temp', 'r+');

apps/files_external/tests/config.php

@@ -8,7 +8,7 @@ return array(
 		'root'=>'/test',
 	),
 	'webdav'=>array(
-		'run'=>true,
+		'run'=>false,
 		'host'=>'localhost',
 		'user'=>'test',
 		'password'=>'test',
@@ -26,11 +26,11 @@ return array(
 		'run'=>false,
 		'user'=>'test:tester',
 		'token'=>'testing',
-		'host'=>'ubuntu.local:8080/auth',
+		'host'=>'localhost.local:8080/auth',
 		'root'=>'/',
 	),
 	'smb'=>array(
-		'run'=>true,
+		'run'=>false,
 		'user'=>'test',
 		'password'=>'test',
 		'host'=>'localhost',