* Allow a user to obtain search results for a particular subsite when the request comes from a query
When attempting to do this in project code, SearchVariantSubsites kicks in and replaces any filter you've applied with the current subsite ID, which prevents you from searching for filtered results in another subsite.
This fix prevents the module from doing this if a filter is applied on the query
TODO write unit tests for the filter() and exclude() behaviours
Elliot Sawyer