conradchen b4cab87015 [Card] Fix crash on Pre-Q devices when checked icon is null
LayerDrawable has this bug that if any of the provided drawables are null during creation, it crashes. The fix is only available on Q+. Fixes this by providing a dummy drawable when we find checked icon is null.

Resolves https://github.com/material-components/material-components-android/issues/2532

PiperOrigin-RevId: 426179927
2022-02-03 20:19:40 -08:00
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