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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 absent(version,
           name):
    '''
    Ensure that the named cluster is absent

    version
        Version of the postgresql server of the cluster to remove

    name
        The name of the cluster to remove

        .. versionadded:: 2015.XX
    '''
    ret = {'name': name,
           'changes': {},
           'result': True,
           'comment': ''}

    #check if cluster exists and remove it
    if __salt__['postgres.cluster_exists'](version, name):
        if __opts__.get('test'):
            ret['result'] = None
            msg = 'Cluster {0}/{1} is set to be removed'
            ret['comment'] = msg.format(version, name)
            return ret
        if __salt__['postgres.cluster_remove'](version, name, True):
            msg = 'Cluster {0}/{1} has been removed'
            ret['comment'] = msg.format(version, name)
            ret['changes'][name] = 'Absent'
            return ret

    # fallback
    ret['comment'] = 'Cluster {0}/{1} is not present, so it cannot ' \
                     'be removed'.format(version, name)
    return ret