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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def ext_pillar(minion_id,
               pillar,  # pylint: disable=W0613
               command):
    '''
    Execute an unmodified puppet_node_classifier and read the output as YAML
    '''
    try:
        data = salt.utils.yaml.safe_load(__salt__['cmd.run']('{0} {1}'.format(command, minion_id)))
        return data['parameters']
    except Exception:
        log.critical('YAML data from %s failed to parse', command)
        return {}