How to make a field required in admin site

Hi everybody,

I have a model inherited from a third application call Video in that
model they have the thumbnail field with blank = True, this make in
the admin site that user could left in blank the thumbnail field,
that's something I don't want to happen, I want to make in the
admin.py in VideoAdmin the field thumbnail required, how is possible
that ??? anybody knows how to achieve that ???

I am working with django 1.3

Regards,
Ariel

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