Bar chart broken when using Chart.js 2.9.0+ and using tooltip

[markokimpel]

Steps to repeat:

• Using bar chart example at https://nagix.github.io/chartjs-plugin-rough/samples/bar.html as base. (It references Chart.js 2.8.0.)
• Working configuration with Chart.js 2.8.0: https://jsfiddle.net/f1ropz3e/
• Not working configuration with Chart.js 2.9.0: https://jsfiddle.net/v3wrjh8g/
• Scenario:
  -- hover over bar: Properly rendered tooltip shown
  -- leave bar: tooltip disappears

When using Chart.js 2.9.0 (or the latest 2.9.4) a JavaScript error is thrown when hovering over a bar and the chart remains in a white-ish color.

I did some digging:

• In chartjs-plugin-rough.js, RoughTooltip>drawBody>ctx.fillRect and ctx.StrokeRect 'options.fillOptions' and 'options.strokeOptions' are accessed. This is where the error occurs.
• Variable 'options' is updated in the customized 'helpers.each'. The logic expects Chart.js to use helper.each to iterate. Chart.js is not using that method in that place anymore.

drawBody in Chart.js 2.8.0:
// Draw body lines now
helpers$1.each(body, function(bodyItem, i) {

drawBody in Chart.js 2.9.0:
// Draw body lines now
for (i = 0, ilen = body.length; i < ilen; ++i) {
bodyItem = body[i];