Assets -> Performance - percentage area chart with missing points

Bug

Description

In case of 2 (or more series) where one (or more) has missing some data points (days) the chart breaks (visually):

This typically happens when one series is from exchange A (like SPLG [US]) and the other from exchange B (like VUSA.L [GB]). In the case above there are 2 holidays (15/1 and 19/2) which means there are no data from exchange A (was closed on those days) on those days.

TODO

Highcharts has no solution to this. The problem is in dataset. The "right join" solution is not a way because the chart would display only daterange where all series can contribute with datapoints - useless. The way might be to detect for missing 1-2 days in datasets (comparing to other series) and then deleting those points - we can afford to delete a day or two from such high-overview chart.