The validation error happens when the formset is passed an empty 
dictionary. The docs (release notes for 1.3) suggest passing None instead. 
So doing this should fix the problem:
>
> TenantFormset(data=self.data or None, instance=instance, 
prefix='TENANTS_%s' % pk_value)

In my case, which is similar to Nathan's, this made the validation error to 
go away.

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