FIX: Failed to export contact categories with contact extra fields

htdocs/core/modules/modCategorie.class.php

 <?php
 /* Copyright (C) 2005      Matthieu Valleton    <mv@seeschloss.org>
  * Copyright (C) 2005-2014 Laurent Destailleur  <eldy@users.sourceforge.net>
- * Copyright (C) 2012	   Juanjo Menent		<jmenent@2byte.es>
+ * Copyright (C) 2012-2016 Juanjo Menent		<jmenent@2byte.es>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -302,6 +302,7 @@ class modCategorie extends DolibarrModules
 		$this->export_sql_end[$r]  = ' FROM ' . MAIN_DB_PREFIX . 'categorie as u, '.MAIN_DB_PREFIX . 'categorie_contact as cp, '.MAIN_DB_PREFIX . 'socpeople as p';
 		$this->export_sql_end[$r] .= ' LEFT JOIN ' . MAIN_DB_PREFIX . 'c_country as country ON p.fk_pays = country.rowid';
 		$this->export_sql_end[$r] .= ' LEFT JOIN ' . MAIN_DB_PREFIX . 'societe as s ON s.rowid = p.fk_soc';
+        $this->export_sql_end[$r] .= ' LEFT JOIN ' . MAIN_DB_PREFIX . 'socpeople_extrafields as extra ON extra.fk_object = p.rowid';
 		$this->export_sql_end[$r] .= ' WHERE u.rowid = cp.fk_categorie AND cp.fk_socpeople = p.rowid AND u.entity IN ('.getEntity('category',1).')';
 		$this->export_sql_end[$r] .= ' AND u.type = 4'; // contact categories