--- a/util/sql.lua	Tue Mar 22 14:42:55 2016 +0100
+++ b/util/sql.lua	Wed Mar 23 12:17:28 2016 +0000
@@ -328,7 +328,7 @@
 		local ok, actual_charset = self:transaction(function ()
 			return self:select"SHOW SESSION VARIABLES LIKE 'character_set_client'";
 		end);
-		local charset_ok;
+		local charset_ok = true;
 		for row in actual_charset do
 			if row[2] ~= charset then
 				log("error", "MySQL %s is actually %q (expected %q)", row[1], row[2], charset);