Provide the formset corresponding to this DataTable.

        Use this to validate the formset and to get the submitted data back.

def get_formset(self):
        """Provide the formset corresponding to this DataTable.

        Use this to validate the formset and to get the submitted data back.
        """
        if self._formset is None:
            self._formset = self.formset_class(
                self.request.POST or None,
                initial=self._get_formset_data(),
                prefix=self._meta.name)
        return self._formset