From 1d82660ace32e43897f02af1efbf2ecb9f530dd0 Mon Sep 17 00:00:00 2001
From: Alexandre Emsenhuber <ialex@users.mediawiki.org>
Date: Thu, 17 Apr 2008 19:56:31 +0000
Subject: [PATCH] This is a bit weired but... Don't throw a MySQL error if
 revision table is empty

---
 maintenance/populateParentId.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/maintenance/populateParentId.php b/maintenance/populateParentId.php
index 4b73070eed..366c457c2b 100644
--- a/maintenance/populateParentId.php
+++ b/maintenance/populateParentId.php
@@ -22,6 +22,14 @@ function populate_rev_parent_id( $db ) {
 	echo "Populating rev_parent_id column\n";
 	$start = $db->selectField( 'revision', 'MIN(rev_id)', false, __FUNCTION__ );
 	$end = $db->selectField( 'revision', 'MAX(rev_id)', false, __FUNCTION__ );
+	if( is_null( $start ) || is_null( $end ) ){
+		echo "...revision table seems to be empty.\n";
+		$db->insert( 'updatelog',
+			array( 'ul_key' => 'populate rev_parent_id' ),
+			__FUNCTION__,
+			'IGNORE' );
+		return;
+	}
 	# Do remaining chunk
 	$end += BATCH_SIZE - 1;
 	$blockStart = $start;
-- 
2.20.1