Empty result when rank.by ID was not found
When doing a similarity search with
rank.by=id and the specific id cannot be found in the index, no exception will be thrown anymore.
Instead, an empty result will be returned.
This way pixolution flow behaves more Solr compliant which also returns an empty result set if a keyword cannot be found.
Nevertheless, parsing errors of the param will still throw an exception to make you aware of a wrong syntax.