DO NOT FORWARD-PORT: the functionality is not used anymore in v9
Commit aaf9badb filters the returned ids by keeping the domain in the
request. However, `this.dataset.domain` might be empty, while
`self.dataset.get_domain()` will retrieve it from the model.
Since `get_domain` is not always defined on the dataset, we keep
`this.dataset.domain` as a fallback. The fix is not great, and a better
solution should be found in master branch when the web refactoring is
done.
opw-666755