add more addtitional speakers constraints

pinax / symposion

a Django project for conference websites

BSD 3-Clause "New" or "Revised" License

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Closed miurahr closed 9 years ago

miurahr commented 9 years ago

additional speakers has been protected in forms but paranoia protection here.

also add __unicode__() for AdditionalSpeaker that is used when admin try to remove it.

Signed-off-by: Hiroshi Miura miurahr@linux.com