Merge branch 'cluster' of github.com:NodeBB/NodeBB into cluster

src/database/mongo/sets.js

@@ -61,7 +61,7 @@ module.exports = function(db, module) {
 			}
 
 			values = values.map(function(value) {
-				return items && Array.isArray(items.members) && items.members.indexOf(value) !== -1;
+				return !!(items && Array.isArray(items.members) && items.members.indexOf(value) !== -1);
 			});
 
 			callback(null, values);