Arearange / areasplinerange - Null values not working

[hkostia]

https://jsfiddle.net/29jd3duh/1/

Error: Invalid value for <path> attribute d="L"
SVGElement.dSetter @ highcharts.src.js:3134
SVGElement.attr @ highcharts.src.js:2367
SVGElement.animate @ highcharts.src.js:2113
(anonymous function) @ highcharts.src.js:16609
each @ highcharts.src.js:1158
extendClass.drawGraph @ highcharts.src.js:16602
Series.render @ highcharts.src.js:15188
Series.redraw @ highcharts.src.js:15270
(anonymous function) @ highcharts.src.js:12126
each @ highcharts.src.js:1158
Chart.redraw @ highcharts.src.js:12123
Chart.setSize @ highcharts.src.js:12662
(anonymous function) @ highcharts.src.js:12579

Earlier it was possible to define null areas.

Tested with 4.2.2.

[TorsteinHonsi]

The arearange fails only if data is empty or there are exclusively null points.

Simplified demo.