test: Fix ViewController test

Signed-off-by: Christopher Ng <chrng8@gmail.com>

Author: Pytal

apps/files/tests/Controller/ViewControllerTest.php

@@ -148,6 +148,10 @@ public function testIndexWithRegularBrowser() {
 			->with('testuser1')
 			->willReturn($baseFolderFiles);
 
+		$baseFolderFiles->expects($this->any())
+			->method('search')
+			->willReturn([]);
+
 		$this->config
 			->expects($this->any())
 			->method('getAppValue')