Merge pull request #13952 from owncloud/fix_migration

[encryption] don't check if we have a valid user during migration

apps/files_encryption/lib/migration.php

@@ -256,13 +256,9 @@ class Migration {
 						if (substr($file, 0, strlen($filename) +1) === $filename . '.') {
 
 							$uid = $this->getUidFromShareKey($file, $filename, $trash);
-							if ($uid === $this->public_share_key_id ||
-									$uid === $this->recovery_key_id ||
-									\OCP\User::userExists($uid)) {
 							$this->view->copy($oldShareKeyPath . '/' . $file, $target . '/' . $uid . '.shareKey');
 						}
 					}
-					}
 
 				}
 			}