Fix plugins except log in plugin install

        module.on = self._decorator_event

        try:

            exec plugin_body in module.__dict__

        except Exception:

            err_msg = 'Error during plugin installation (%s)' % self.name

        except Exception as exc:

            err_msg = 'Error during plugin installation (%s): %s' % (

                self.name, exc)

            logger.exception(err_msg)

            raise RuntimeError(err_msg)

        else: