Throw exception when nothing to clone in CloneDatabase

Just in case something goes wrong, when calling.

Change-Id: I4490aee6edccf0b185188250948a47b5fd8ba766

diff --git a/includes/db/CloneDatabase.php b/includes/db/CloneDatabase.php
index 1564fab..5f09555 100644 (file)
--- 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;