Bug: barThickness is mandatory, charts break if not supplied

[MBlistein]

Usually the barThickness is an optional value. I would prefer to not use it, since this static value has significant disadvantages when displaying charts of different size screens.
However, when removing it in the current code, the entire chart fails.

[fanthos]

I think the barThinkness should be reimplemented as barMaxThinkness.

Currently the chart can be resized by external code. ref: home-assistant
Just use the code after creating the chart with setTimeout.