How to check "findeOne()", if fail?

help
1

How to check “findeOne()”, if fail?

        var reg = ...........;
        var obj = collection.findOne(reg, {sort: sortBy});
        if (_.isNull(obj)) {
            console.log('do not data');
        } else {
            console.log('have data');
        }

Pleas help me.

2 
    var reg = ...........;
    var obj = collection.findOne(reg, {sort: sortBy});
    if (obj) {
        console.log('have data');
    } else {
        console.log('do not data');
    }

I think that should work?