'Uses _get_empty_context and adds the `instance` object to the local
context. Context here is to be intended as the context of the nodelist
in the block.'

def get_context(self, context, **kwargs):

    kwargs.pop('varname')
    kwargs.pop('nodelist')
    extra_context = self._get_empty_context(context, **kwargs)
    extra_context['instance'] = kwargs.get('instance')
    extra_context['render_model_block'] = True
    return extra_context
