From e3db33c615adf47faf4558d9e585ee4cfcf64e8f Mon Sep 17 00:00:00 2001
From: Umherirrender <umherirrender_de.wp@web.de>
Date: Thu, 23 Aug 2018 21:02:41 +0200
Subject: [PATCH] Throw exception when nothing to clone in CloneDatabase

Just in case something goes wrong, when calling.

Change-Id: I4490aee6edccf0b185188250948a47b5fd8ba766
---
 includes/db/CloneDatabase.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/includes/db/CloneDatabase.php b/includes/db/CloneDatabase.php
index 1564fab225..5f09555e7a 100644
--- a/includes/db/CloneDatabase.php
+++ b/includes/db/CloneDatabase.php
@@ -52,6 +52,9 @@ class CloneDatabase {
 	public function __construct( IMaintainableDatabase $db, array $tablesToClone,
 		$newTablePrefix, $oldTablePrefix = null, $dropCurrentTables = true
 	) {
+		if ( !$tablesToClone ) {
+			throw new InvalidArgumentException( 'Empty list of tables to clone' );
+		}
 		$this->db = $db;
 		$this->tablesToClone = $tablesToClone;
 		$this->newTablePrefix = $newTablePrefix;
-- 
2.20.1