Do no try to parse empty SQL query (bug #1303994).

ChangeLog

@@ -18,6 +18,8 @@ $Source$
     * libraries/display_import.lib.php: Sort list of import plugins.
     * mult_submits.inc.php, tbl_properties_structure.php: Support for browsing
       selected columns (RFE #1275909).
+    * libraries/common.lib.php: Do no try to parse empty SQL query (bug
+      #1303994).
 
 2005-09-25 Marc Delisle  <lem9@users.sourceforge.net>
     * server_privileges.php: support MySQL 5 privileges 

libraries/common.lib.php

@@ -597,6 +597,8 @@ if ($is_minimum_common == FALSE) {
         // Revised, Robbat2 - 13 January 2003, 2:59PM
         if (!function_exists('PMA_SQP_isError') || PMA_SQP_isError()) {
             $formatted_sql = htmlspecialchars($the_query);
+        } elseif (empty($the_query)) {
+            $formatted_sql = '';
         } else {
             $formatted_sql = PMA_formatSql(PMA_SQP_parse(PMA_sanitize($the_query)), $the_query);
         }