[FIX] base/ir_model: upon custom field creation, always clear manual fields in registry

The invalidation in registry was done only if the field's model was already in
registry.  This situation is not the case when you create a custom model with a
custom field.

openerp/addons/base/ir/ir_model.py

@@ -383,13 +383,13 @@ class ir_model_fields(osv.osv):
             if vals.get('relation',False) and not self.pool['ir.model'].search(cr, user, [('model','=',vals['relation'])]):
                 raise except_orm(_('Error'), _("Model %s does not exist!") % vals['relation'])
 
+            self.pool.clear_manual_fields()
+
             if vals['model'] in self.pool:
                 model = self.pool[vals['model']]
                 if vals['model'].startswith('x_') and vals['name'] == 'x_name':
                     model._rec_name = 'x_name'
 
-                self.pool.clear_manual_fields()
-
                 # re-initialize model in registry
                 model.__init__(self.pool, cr)
                 self.pool.setup_models(cr, partial=(not self.pool.ready))