keystoneclient does not give feedback for required arguments

Steps to reproduce:

keystone --debug --username admin --password secrete --tenant_name admin --auth-url http://127.0.0.1:5000/v2.0/ tenant-delete

Expected:

Helpful feedback telling me how to specify the tenant_id

Actual:

send: 'POST /v2.0/tokens HTTP/1.1\r\nHost: 127.0.0.1:5000\r\nContent-Length: 102\r\ncontent-type: application/json\r\naccept-encoding: gzip, deflate\r\nuser-agent: python-keystoneclient\r\n\r\n{"auth": {"tenantName": "admin", "passwordCredentials": {"username": "admin", "password": "secrete"}}}'
reply: 'HTTP/1.1 200 OK\r\n'
header: Content-Type: application/json; charset=UTF-8
header: Content-Length: 1980
header: Date: Tue, 14 Feb 2012 18:07:14 GMT
connect: (192.168.2.10, 35357)
send: u'DELETE /v2.0/tenants/None HTTP/1.1\r\nHost: 192.168.2.10:35357\r\nx-auth-token: 31d5453773d94e2d97ee0f299f1a8952\r\naccept-encoding: gzip, deflate\r\nuser-agent: python-keystoneclient\r\n\r\n'
reply: 'HTTP/1.1 500 Internal Server Error\r\n'
header: Content-Type: text/plain
header: Content-Length: 4590
header: Date: Tue, 14 Feb 2012 18:07:14 GMT
header: Connection: close
No handlers could be found for logger "keystoneclient.client"