[charts] Keyboard navigation does not support null values #20746
Description
Steps to reproduce
When some values of the charts are set to null the focused elements goes at meaning less position. It should just skip those values to go at the next/prev available value
Current behavior
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Expected behavior
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Context
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Your environment
npx @mui/envinfo
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Output from `npx @mui/envinfo` goes here.
Search keywords: a11y, charts, focus, keyboard