When a method returns IEnumerable<T> and I do not have anything to return, we can use Enumerable.Empty<T>().
IEnumerable<T>
Enumerable.Empty<T>()
Is there an equivalent to the above for a method returning IQueryable<T>
IQueryable<T>
Enumerable.Empty<T>().AsQueryable(); should do it.
Enumerable.Empty<T>().AsQueryable();