do not attempt to clear canvas if one does not exist

[DAcodedBEAT]

Expected behavior

clearCanvas() from helpers.canvas.ts should only call getContext() on valid truth-y ctx values.

Current behavior

helpers.canvas.js:119 Uncaught TypeError: Cannot read properties of null (reading 'getContext')
    at clearCanvas (helpers.canvas.js:119:23)
    at Chart.clear (core.controller.js:268:5)
    at Chart.draw (core.controller.js:718:10)
    at core.animator.js:89:15
    at Map.forEach (<anonymous>)
    at Animator._update (core.animator.js:60:18)
    at core.animator.js:45:12

Closes #11743

Reproducible sample

#11743

Optional extra steps/info to reproduce

No response

Context

.

chart.js version

4.4.2

Browser name and version

experienced on multiple browsers

Link to your project

No response

[DAcodedBEAT]

Thanks @LeeLenaleee , do you have an approximation for 4.5.0 being released?

[LeeLenaleee]

I think we might be able to do a 4.4.3 release since there are only bug fixes soon