docs: def clean(self):
          """Check that at least one service has been entered."""
          super(AtLeastOneRequiredInlineFormSet, self).clean()
          if any(self.errors):
              return
          if not any(cleaned_data and not cleaned_data.get('DELETE', False) for cleaned_data in self.cleaned_data):
              raise forms.ValidationError('Прикрепите не менее одного документа')