[FIX] partner_multi_relation: Another comparison fix with search arguments

partner_multi_relation/models/res_partner.py

@@ -156,7 +156,8 @@ class ResPartner(models.Model):
         active_args = []
         if self.env.context.get('active_test', True):
             for arg in args:
-                if is_leaf(arg) and arg[0].startswith('search_relation'):
+                if (is_leaf(arg) and isinstance(arg[0], basestring) and
+                        arg[0].startswith('search_relation')):
                     active_args = [('relation_all_ids.active', '=', True)]
                     break
         return super(ResPartner, self).search(