Possibility to hide bars with value set to 0

[dnbo]

I'm submitting a ...

• [ ] bug report - search github for a similar issue or PR before submitting
• [x] feature request
• [ ] support request - use StackOverflow (add the ngx-charts tag) or the gitter chat for support questions

Current behavior When using a grouped vertical bar chart, there is alot of empty space when some groups have values set to 0. It should be possible to hide bars that have 0-values, like the composed image below. Note that the "Guerney" and "Oman" group are missing the purple bar since they are 0. In reality they would just show an empty blank space.

Expected behavior Possibility to hide bars with 0-values.

Reproduction of the problem

What is the motivation / use case for changing the behavior? Get rid of large blank areas in chart.

• ngx-charts version: 10.0.0

[zhangxin511]

I just opend a PR for this at https://github.com/swimlane/ngx-charts/pull/1086