Execute a command and read the output as YAMLEX

def ext_pillar(minion_id,  # pylint: disable=W0613
               pillar,  # pylint: disable=W0613
               command):
    '''
    Execute a command and read the output as YAMLEX
    '''
    try:
        command = command.replace('%s', minion_id)
        return deserialize(__salt__['cmd.run']('{0}'.format(command)))
    except Exception:
        log.critical('YAML data from %s failed to parse', command)
        return {}