[FIX] migration: test if package is installed using its state.

checking if there is an installed version set is not enough because this field is not reset when the module is uninstalled

openerp/modules/migration.py

@@ -3,7 +3,7 @@
 #
 #    OpenERP, Open Source Management Solution
 #    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
-#    Copyright (C) 2010-2013 OpenERP s.a. (<http://openerp.com>).
+#    Copyright (C) 2010-2014 OpenERP s.a. (<http://openerp.com>).
 #
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU Affero General Public License as
@@ -90,7 +90,7 @@ class MigrationManager(object):
             'post': '[%s>]',
         }
 
-        if not (hasattr(pkg, 'update') or pkg.state == 'to upgrade') or pkg.installed_version is None:
+        if not (hasattr(pkg, 'update') or pkg.state == 'to upgrade') or pkg.state == 'to install':
             return
 
         def convert_version(version):