Drilldown: data points set as array with keys used prevents successful drilldownCategory

[KacperMadej]

Behaviour

When point data is loaded as array with defined keys and drilldownFromPoint is disable then drilldownCategory cannot find the drilldown property on data point (because it's not there) in getDDPoints.

Relevant code:

highcharts/js/modules/drilldown.src.js

Line 997 in d889a2f

series.options.data[i].drilldown

In:

highcharts/js/modules/drilldown.src.js

Lines 986 to 1005 in d889a2f

	H.Axis.prototype.getDDPoints = function (x) {
	var ret = [];
	each(this.series, function (series) {
	var i,
	xData = series.xData,
	points = series.points;
	for (i = 0; i < xData.length; i++) {
	if (
	xData[i] === x &&
	series.options.data[i] &&
	series.options.data[i].drilldown
	) {
	ret.push(points ? points[i] : true);
	break;
	}
	}
	});
	return ret;
	};

Live demo with steps to reproduce

Edited default demo for allowPointDrilldown: false
http://jsfiddle.net/BlackLabel/69wytk5x/

Steps:

1. click on a column to try drilling down
2. only an empty drill up button is added