On connection error not handled on redis client.

[alexdobarganes]

Consider setting the listener this.client.on('error', function (err) { return; }); to avoid the error bubbling up and causing the app to die.

private connect(cb: (e: Error) => void) {
        this.client = redis.createClient(this.redisServer.port,this.redisServer.hostname);
        this.client.on('error', function (err) {
            return;
        });
        if(!_.isUndefined(this.redisServer.password)){
            this.client.auth(this.redisServer.password, (e) => {
                cb(e);
            });
        } else {
            cb(null);
        }
    }