Fixed a bug for caching invalid queries

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0@9127 201d5d3c-b55e-5fd7-737f-ddc643e51545

modules/install/install.controller.php

@@ -166,7 +166,8 @@
             Context::setDBInfo($db_info);
             // Create DB Instance
             $oDB = &DB::getInstance();
-
+			// Force update dbParser
+			XmlQueryParser::getDBParser(true);
             // Check if available to connect to the DB
             if(!$oDB->isConnected()) return $oDB->getError();
             // When installing firebire DB, transaction will not be used