Added minor utility func

src/libs/database/impl/TrackList.cpp

@@ -107,6 +107,12 @@ TrackList::getById(Session& session, IdType id)
 	return session.getDboSession().find<TrackList>().where("id = ?").bind(id);
 }
 
+bool
+TrackList::isEmpty() const
+{
+	return _entries.empty();
+}
+
 std::size_t
 TrackList::getCount() const
 {

src/libs/database/include/database/TrackList.hpp

@@ -79,6 +79,7 @@ class TrackList : public Wt::Dbo::Dbo<TrackList>
 		void		clear() { _entries.clear(); }
 
 		// Get tracks, ordered by position
+		bool isEmpty() const;
 		std::size_t getCount() const;
 		Wt::Dbo::ptr<TrackListEntry> getEntry(std::size_t pos) const;
 		std::vector<Wt::Dbo::ptr<TrackListEntry>> getEntries(std::optional<std::size_t> offset = {}, std::optional<std::size_t> size = {}) const;