<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_app(self, appname):
 """ returns app object or None """

        try:
            app = APPS.get_app_config(appname)
        except Exception as e:
            self.err(e)
            return
        return app