Two 'bar' traces are not showing with empty data

[sandertar]

Hi! I try to create two time series with type 'bar'.
One trace didn't contain any data, but this one should be shown in legend. To make this trace visible in legend, I have set x: [null] and y: [null];
But in this case both series are not displaying.
https://codepen.io/sandertar/pen/VPmOdK
Is there any other way to make label visible in legend for trace without data?

[etpinard]

Thanks for writing in. Your codepen points a few separate issues.

First, https://codepen.io/etpinard/pen/xggwYq is probably the best you can do with the current version. You might not like that the trace 1 legend item is semi-transparent, our apologies 😃

Looks like there's a bug with how the null trace interacts with other the trace to compute the bar widths. This bug should be easy to fix.

Moreover, I believe that something like

trace = {
  visible: true,
  x: [],
  y: []
}

where the user explicitly set visible: true should appear in the legend. At the moment, traces with x.length === 0 and y.length === 0 are taken to be visible: false no matter what the users inputs. Modifying this logic would be a much longer and harder project; I can't guarantee it's going to happen.

[sandertar]

Ok, thanks