count crashes if no node has no children

[clibu]

db.ref('songs').count(); will raise an exception if the 'songs' node has no children.

data-reference.ts

    count() {
        return this.reflect("info", { child_count: true })
        .then(info => {
            return info.children.count;  <<<-- HERE
        })
    }

[appy-one]

Fix published in version 1.1.4