would this be preferable?
--------------------------------------------------------
from admin.py
--------------------------------------------------------
class HDChannelInline(admin.TabularInline):
    model = HDChannel
    extra = 0
    template = 'admin/edit_inline/tabular.html'

    def get_formset(self, request, obj=None, **kwargs):
        if obj is not None:
            if obj.asset_type == 'broadcast_radio':
                kwargs['extra'] = 2
        return super(HDChannelInline, self).get_formset(request, obj,
**kwargs)

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