MACD unable to remove when no plot

[KacperMadej]

Behaviour

No plot due to not enough data in base series. On the MACD remove - error.
this.graphmacd = this.graphmacd.destroy();

Live demo with steps to reproduce

http://jsfiddle.net/BlackLabel/5gsmy12w/1/

Steps:

1. click destroy
2. error in browser console

Internal note: Might be related to #8847

[pawelfus]

Workaround:
Overwrite destroy() for MACD, demo: http://jsfiddle.net/BlackLabel/u128rx05/

Snippet:

(function(H) {
  H.seriesTypes.macd.prototype.destroy = function() {
    // this.graph is null due to removing two times the same SVG element
    this.graph = null;
    this.graphmacd = this.graphmacd && this.graphmacd.destroy();
    this.graphsignal = this.graphsignal && this.graphsignal.destroy();

    H.seriesTypes.sma.prototype.destroy.apply(this, arguments);
  };
})(Highcharts);