Merge pull request #26808 from nextcloud/backport/26647/stable21

[stable21] Fail when creating new files with an empty path

Author: juliusknorr

lib/private/Files/Node/Folder.php

@@ -190,6 +190,9 @@ public function newFolder($path) {
 	 * @throws \OCP\Files\NotPermittedException
 	 */
 	public function newFile($path, $content = null) {
+		if (empty($path)) {
+			throw new NotPermittedException('Could not create as provided path is empty');
+		}
 		if ($this->checkPermissions(\OCP\Constants::PERMISSION_CREATE)) {
 			$fullPath = $this->getFullPath($path);
 			$nonExisting = new NonExistingFile($this->root, $this->view, $fullPath);