Filtering the recordings without any score in the search page

[sertansenturk]

In the search, it would be useful for the users to filter the recordings without any score for more informed navigation of the corpus.

This issue is not urgent since we will have the new front end soon. I guess it would be easy incorporate this to the new search options.

[sertansenturk]

@alastair when I want to show demo Dunya to other people, this is the most recurring need (i.e. opening a recording with aligned score).

If we can make a single change, this would be the one to spend the resources.